Proper fix for configuration files getting stripped while testing standalone in XCode.
Fixed spurious exception at startup from missing userdefault.
Fixed crash when restarting standalone Boxer while testing from XCode.
Disable "Return to Launch Options" menu item while at the launch panel.

This was coded to happen all along, but didn’t work because of AppKit’s
steadfast refusal to call validateMenuItem: for menu items that have
bindings. Bindings! What a great fucking idea those were.
Bumped app version numbers.