Mathomatic 15.5.3

Simplify expressions with positive bases like 16^(x/2) and (2^m)^n by default;
previously only simplified these with the "simplify symbolic" command.

3/22/11 - The exit status of Mathomatic now shows any errors when run with the
          -e option. So if a command fails, it exits to the OS with the exit
          status 1. Exit status is 0 if everything went OK. Also works without
          the -e option, when files are specified on the shell command line.
          An error will abort the script, returning you to the operating system
          with an exit status of 1.

3/23/11 - Changed makefile to allow installing m4 Mathomatic without installing
          the documentation. Use "sudo make bininstall matho-rmath-install" to
          install m4 Mathomatic executables and man pages.
          Then "sudo make docinstall" installs all documentation.

3/26/11 - The rmath man page math function and constant lists have been corrected
          and the rmath man page has been added to the main user documentation.

3/27/11 - Output of universal constants is now prettier when displaying. No
          more i#, e#, and pi#, they are displayed as they are entered: i, e,
          and pi. HTML mode displays the small Greek letter pi for pi.

3/29/11 - The nintegrate command now works with complex numbers and trigonometry,
          and does not change the current equation to the result.

3/30/11 - Link the man page rmath.1 to matho.1 when installing, so that every
          executable has a man page.

4/04/11 - Added "numerator" and "denominator" options to the fraction command,
          which returns only the numerator or denominator after making sure the
          expression is a simple algebraic fraction.

          Autocalc now deletes only the previous autocalc when autocalc is used.
          It was deleting all autocalc results except for the current one every
          time, preventing copying.

4/15/11 - Improved simplification of expressions like (x + (2^(1/2)))^{3,4,5,6}.
          It broke a while back when factor_times() constant factoring was
          improved. The fix uses factor_times() less, preserving reduced surds.

4/17/11 - Saving "plot_prefix" with the "set save" command was not escaping
          semicolons, so they were disappearing from the prefix. Fixed now.