This change should make base applet code easier to modify without modifying applets itself. This is also
a starting point for implementation of better routing netwm messages to applets without adding specific listener
to each applet.
Dumping usage of FL_SHOW event in ede-panel; everything is now handled in Panel::show().
Call Panel::hide() even if ede-panel was ended/killed with outside signal; with this configuration file will be stored.
Remember panel position (top/bottom).
