This patch adds an option for idleHistory to be
a-cyclic -- holding the Alt-P keys will bring all the
commands typed, one by one, and stop at the first one.
This, I think, is more intuitive - when history is
cyclic, and you press Alt-P continuously, you have no
sense of your position, since it's always jumping from
end to beginning. That's why I added this option, and
that's why I made it a-cyclic by default.

The diffs are against idlefork 0.9b1, but work against
current idle cvs.

Noam