Patch #1. This patch does the following:
- Removes custom definitions for LONGLONG_MIN, LONGLONG_MAX and 
   ULONGLONG_MAX and uses the standard LLONG_MIN, LLONG_MAX 
   and ULLONG_MAX instead.
- Removes custom definitions for M_PI, M_E and M_LN2 and uses the
   math.h versions instead.
- Misc other minor cleanups in my_global.h