Log Message:
Update mathomatic to 12.5.1.

Changes:
- Corrected color and html mode routines.
- get_expr() now has equation space pull.
- You may now enter a "#" followed by an equation space number when
  prompted for an expression.
- Ported nintegrate command to non-equations.  No more commands to port.
- Made redirected output ignore screen_columns.
- Added "-q" option (quiet mode, don't display prompts).
= The Mathomatic man page was improved.