Pressing Esc closes overview.

Pressing Ctrl-n should open the add activity dialog, but for some reason it does not work.  I am new to Gtk3, so any help would be greatly appreciated!

BTW, this is my first contribution to hamster.  It is small because I want to test the waters before I jump in.
set active grabs focus instead of clicking, simply call the func itself: `dialogs.edit.show(self)` here