Functions to be changed to accept and/or return const objects
(- means still to do, + means finished)

Please use the grep command with FIX_CONST_GUI or FIX_CONST to find
additional places where is something to do.

+ lib/cull
- lib/gdi
   libs/gdi/cull_parse_util.c
+ lib/sched
+ lib/uti
+ lib/comm