Log Message:
Update mathomatic to 12.6.3.

Changes since 12.6.1:
8/20/06 - Fixed many very minor bugs.  Added variable display precision.
8/21/06 - Display single digit primes when using "matho-primes pal".
8/24/06 - Increase display precision from 12 to 14 decimal digits.
8/27/06 - Added some tiny python programs: "fact/factorial" and \ 
"primes/mult".
8/31/06 - Add alternate command name "display" to flist command.
9/04/06 - Improve eliminate command by allowing "eliminate all all ..." to
          eliminate all variables two or more times.