added support for leave_notify_event in backend_qt4
Make scale colors match line colors in two_scales.py
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
