The define for MAX_EVENT_SIZE was removed from midas.h.

Replacing it is DEFAULT_MAX_EVENT_SIZE set to 4 MiBytes and DEFAULT_BUFFER_SIZE 
set to 32 MiBytes.

For a long time now MIDAS does not have hardcoded maximum event size and buffer size 
and this change merely renames the define to reflect it's current function.

The actual maximum event size is set by ODB /Experiment/MAX_EVENT_SIZE.

The actual event buffer sizes are set by ODB "/Experiment/Buffer sizes/SYSTEM" & co

K.O.