Added shortcut key to toggle TV scanline jittering, and have it default
to off.  I'd really like to enable it again eventually, or perhaps use some
of the code in the case where scanline jumps are *really* large (since it
seems to emulate the output for every TV I've ever seen).

Bumped version #.


git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@3221 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba