need a way to disable or modify ulimit parameters globally

[DanGrayson]

... because some machines are slow, especially those being run in emulators.

Some limits are hard coded in M2/Macaulay2/m2/html.m2. Some are set as make-variables in files such as M2/Macaulay2/packages/Macaulay2Doc/test/Makefile.test.in.

Thanks to Brent Baccala for the suggestion.