Log Message:
Update mathomatic to 12.5.3.

Changes:
- Ported matho-primes, matho-twin, and matho-pascal to long doubles.
  "make test" added in "primes" directory.
- Alphabetic case sensitive mode set by default.
- Added "list maxima" option.  "list export" is now for \ 
other programs.
- Code cleanup.