I committed several small fixes and changes:

- install.txt which mentions explicitly ROOT
- mana.c and the main Makefile which fixes all HBOOK compiler warnings
- mana.c to write an explicit warning if the experiment directoy contains 
uppercase letters in the path (HBOOK does not like this and refuses to 
read/write histos)
- mserver.c, mrpc.c, odb.c to fix a wrong parameter in 
db_remove_open_record() (see previous entry from Paul)
- added experim.h into the dependency of the hbookexpt Makefile