When the number of zones (sub-pads) is changed, any histograms on the active
canvas will be redrawn on the new canvas.  Also, more general code clean-up.

To set the x-axis limits, right click anywhere on a histogram frame and choose
"XaxisLimits" from the popup context menu.  This brings up a dialog box where
you can enter the xmin and xmax values. Click "OK" and all pads within the
currently selected canvas will be redrawn with that x-axis scale.  To reset all
histograms so the x-axes are unzoomed, click "Unzoom".

Every overlayed histogram on a currently drawn histogram, will be drawn in a
different color (up to the max number of colors).

When choosing a new pad division for a canvas (from the "Zones" menu), all
currently drawn histograms on that canvas will be redrawn in the new zones. If
there are fewer pads in the new configuration, the extra histograms are not
drawn.  Overlays (with their color) and x-axis scaling are preserved in the new
configuration.

When opening a .root file, if there are more than 1000 histograms in the file,
the display is divided up into folders, where each folder holds 250 histograms
(except for the final folder, which may be smaller).  This was done because of a
problem with TGListTree which only shows up with a large numbers of objects.

A minor update to the previous bug fix...
Modified Roody.cxx to display the histogram name range instead of the counter
range on the subfolders when reading > 1000 histograms from a file.

A "ZoomOption" has been added to the context menu produced by right clicking 
anywhere on a histogram frame.  This opens up a new canvas, titled "Zoom
Canvas", containing a copy of the histogram in the original frame.

The y-axis scales can now be fixed just like the x-axis scales.  Choose
YaxisLimits from the context menu when right-clicking on a histogram frame and a
small dialog box will open in which you can enter the min and max values.  If
the frame is part of a multipad canvas, all pads on that canvas will be redrawn
with the new scales.  Choose YaxisLimits again and click on the Unzoom button to
unzoom all pads on that canvas.

A timer has been added to check if the online socket remains valid.  If, say,
the analyzer has been stopped while running Roody, this will be detected and the
connection closed, then, every second, that connection will be attempted until
successful.  Also, the external dtd file, roody.dtd, has been eliminated in
favour of internal dtd verification. Please note that Roody is being linked with
Root version 4.00.08, as version 4.02.00 introduces problems, such as context
menu errors.

Two bugs were introduced yesterday...
 -- program crashes when trying to connect online via  roody -h nodename
    (uninitialized pointer)
 -- program crashes when restoring an xml file which tries to use the
    external dtd file (unchecked error condition)
Both problems are now fixed.

The online timer has been modified for testing whether the online connection is
still valid. If the connection is broken, the timer tests the connection every
second until it has reconnected.  When the connection is finally remade, any
online histograms will again be refreshed as before.  This is now being done
with just the original timer, as 2 timers seem to conflict with each other.

Fixed segmentation fault problems that occurred when connected online, then
having the connection broken, then re-establishing the connection, and then
clicking on an online item in the main window.  The problem is in TGListTree in
the ROOT code, and is fixed here by including 2 routines into MTGListTree.

Roody can now reset online histograms via context menu or main menu.  This
requires a small change in mana.c  Also, fixed a problem with segmentation
faults when trying to connect to an invalid server port.

The group context menu options are changed to "Draw group", "Reset group" and
"Delete group", where "Reset group" means reset any online members of the group
and will only appear if there are online members in that group.  Multiple
selections (left click while holding down the control key) now have a context
menu (right click to open) but the context menu for multiple selections will
only display "New canvas", "Add to group" and, if there are online members,
"Reset", since the options "Current pad", "Overlay on pad" and "Next pad" are
not relevant to multiple selections.  Online folders now have a context menu
with "New canvas", "Add to group" and "Reset" options.

The reset option has been modified to use the new "Command" option in mana.c
instead of the "Reset" option in mana.c, which has been removed.

A memory leak was fixed in Roody.cxx, which occurred when updating a histogram
from a NetFolder object.

1) Memory leak fixed:
 when the plotting destination set to replace, cloned objects with the canvas
 about to be closed are now being deleted first.
2) Group restore fixed:
 when restoring a saved session, and objects from file subdirectories were
 added to a group, they were not being included in that group.  Now the
 data file is searched recursively for subdirectories.
3) Group draw fixed:
 TH2 and TH3 objects in a group were not being drawn.

Fixed refreshing of overlayed online histograms.
Fixed refresh now.
main.cxx:  class Roody now created on the stack instead of the heap.
TNetFolder.cpp:  fixed memory leak relating to TMessage pointer
                 returned by TSocket::Recv( TMessage * )
                 ?? is this related to the memory leak in the analyzer ??

Error messages from Roody will now appear as TGMsgBox forms which require the
user to click the "Dismiss" button to acknowledge the error message.  If the
user chooses the x-axis scales for an online histogram using the mouse to select
a range on the axis, that range will be used for re-displaying the histogram
when it is refreshed. However, if the user chooses "XaxisLimits" from the
context menu, that x-axis scaling will be used for all pads on that canvas, and
a range as described above will be overridden by this scaling.

1) roody has been converted from libxml2 to mxml
2) the files have been shuffled around so the *.cxx, *.cpp files
   are in the roody/src/ directory, the *.h files are in the
   roody/include/ directory, the Makefile is in the top roody/
   directory which is where the roody executable goes while
   roody.so now goes into the roody/lib/ directory. The mxml
   files are in roody/mxml.  The *.o files now go into the
   roody/obj/ directory (which is created by the Makefile if
   it doesn't exist).
3) the Makefile has been redone and simplified, and the windows
   stuff removed, since the windows version has its own makefile.
4) clicking on the Help About menu item now displays a message box
   with the current version.  For now, the code must be edited
   manually for each code revision, but it would be nice to automate
   this. 

Problems with deciding which graphics pad to choose for drawing have been fixed.
 Now the group pads (created by choosing draw group from the group context menu)
and the zoom pad (created by choosing zoom option from the pad context menu) are
treated distinctly from the canvases titled "canvasN" for N=0,1,2,...  Also, a
user supplied zone setting will be displayed in the zones menu, and can be
chosen again later.  Problems with the cvs file locks have been repaired (by
P.Amaudruz).