Implement dragging of sessions into split panes using cmd-opt-shift + drag. Tweak hysteresis threshold of SplitSelectionView and shorten messages

Added pref migration for prompt on close. Added code for jobs tableview. Tweaked prompt on close global prefs. Prmopt on quit logic improved, message improved, that code refactored.

Initial add. May have broken some profile prefs, bulk copy. Need to implement tableview delegate, plus, minus buttons. Need to remove confirmation button from general prefs. Need to add migration code.

Add pinch to change font size. Fix bug where we think we're still zooming after exiting lion fullscreen which breaks e.g. changing font size. Fixes bug 347

Resize tabs after exiting fullscreen. Show/hide tabbar when exiting/entering fullscreen. Fixes bug 1321.

Can be set using:
$ echo -e -n "\033]50;CurrentDir=/Path/To/Directory\007"

Fix bug where window arrangements were incompatible with custom prefs dir. Improve wording of initial alert w/ custom prefs. Add alert when quitting when there are custom prefs and you've changed something