wx GUI: Put the editor plugins in the correct Tab traversal order
wx GUI: Disable the native GTK "live" search on logs

Addresses #351
wx Trayicon: Don't show an accelerator for the Exit action
wx GUI: Explicitly focus the database, not the whole notebook tab
wx GUI: Reorganize default menu accelerators
wx GUI: Improve textarea code
wx GUI: Add focus text area menu action
wx DBsearch: Improve code
wx GUI: Shortcuts for selecting the last notebook tabs
wx GUI: Maintain focus on logs when cycling if they had it
wx Tasklist: store snooze submenus in menu attributes
wx GUI: Simplify code
wx GUI: create_accelerator_table static method
Temporarily work around bug #332
wx GUI: Don't process Tab in the editor text area by default

Addresses #352
TEMP
wx GUI: Temporary fix for #331