fixed leave_notify_event for gtk -- need support for other UIs
added figure/axes enter/leave events
added rc param axes.unicode_minus
added a chance for polar with usetex to remove unicode symbol
removed comment from invalid shared axis merge
Remove code that was inadvertently merged from branch.
scatterpoints support in Legend. patch by Erik Tollerud
fixed a zoom bug in sharex axis
Fix mathtext (bug has existed since r6400 11/12/2008)
