Log Message:
Update mathomatic to 11.3.

Changes:
Substantial change/improvement to simplify command.

Added some more code to fix floating point inaccuracies.

Improved solving.  y=(x+1/x)^3 solves both ways, now.

Full simplify after every loop in derivative command added.

Move derivative and taylor commands to "diff.c".

Added "-m" option to Mathomatic (memory size multiplier).
It sets the size of equation spaces at run time.