feature: hit 'space' to restart

[alexch]

Sometimes I edit a file that's not in the pattern and I want to restart anyway. Hitting 'r' or 'space' should trigger a restart. Now I have to do "control-C !! return" which isn't a major trauma but still.

Also 'c' should do the same with a clear screen (even if -c wasn't originally specified).

[alexch]

done. Actually 'r' does restart, since space is too useful as 'scroll to the bottom of the buffer'.