Log Message:
Update mathomatic to 12.2c.

Changes:
  - Use mkstemp() for temp file in edit command.  Put temp file in "/tmp",
    instead of current directory.
  - Created my_strlcpy(), since Linux doesn't have strlcpy().
  - Made everything declared static that should be.
  - Prime Number Tools cleaned up and compiled with "-Wall".
  - Made them all successfully compile with g++.
  - A bug fix for HTML mode.
  - Completely removed sensitivity command and simplified parsing code.
  - Fixed minor bug in fraction format display routine.