More Efficient Random Generation

[ralmond]

Random generation implemented and tested, but probably very
inefficient in the simple case were we want to generate a set of
several hundred cases to a case file. Should reimplement that on the
C side so we don't need to constantly do the R->c conversions.

Bugzilla: https://pluto.coe.fsu.edu/bugzilla/show_bug.cgi?id=52