RandomGen r; r(); now generates [0,2^31-1] on 32-bit platforms,
not [0,2^31-2]. No longer uses MAX_INT, so the default behavior
doesn't depend on the size of an int.
RandomInt no longer generates a float and truncates it. That
limited the values that could be returned to those that fit in
a 32-bit float.
Remove NR code. It's not free.
This code is not threadsafe. Locking access would kill performance.
The old code wasn't, either. I think most symptoms would be
innocuous enough to not worry about.
Glenn Maynard
f7f21e2b8c