Remove Pymacs from my repo

To think - once upon a time, I thought it would be the mechanism by
which I finally started customizing Emacs.

And now I have no use for it...

well, should I ever need it again, it's still there, waiting to be
undeleted.
Update smart-tabs-mode from ELPA

I don't know that I've ever actually used it, but I could see it being
handy in future.

...not that I approve of tabs, but when in Rome...
Remove revbufs, now that I'm using auto-revert-mode
Remove rope tarball and now-useless readme

And with that, the libraries/ directory is gone.

wooooo.