wx GUI: Simplify code
wx Tasklist: Fix bug
wx Tasklist: Simplify, this doesn't seem to be an issue anymore
wx Tasklist: Let the menu show toggle work even if no databases are open
wx GUI: Optimize menu items status update
wx Tasklist: Disable focus menu item if no database is open
Move time span formatting functions to the pyaux library
Notify: Display item heading in the summary and times in the body
wx GUI: Restore functionality of Ctrl+Enter in text area