Optimizations for repeating general range, and some fixes

Remove the older disabled non-power-of-two range caching with
caching of a general range using RandomIntGeneralPrepareForRepeat()
and RandomIntGeneralRepeat(). The power-of-two equivalent are
provided as RandomIntPowerOfTwoPrepareForRepeat() and
RandomIntPowerOfTwoRepeat().

Improve the Makefile.

Bump version to 0.1.1.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>