in each of the files that uses alloca.

MacOS X port, "home" command/button, lots of bug fixes -- into main branch!

Where appropriate, update references to geomview license too,
now called COPYING.geomview.

Once we pick a license this might change, but
in the mean time, at least the NCSA UIUC origin is noted.

for good accuracy throughout the range.

CONSTify input strings where possible.