Replace NSLog with NSAlerts for the cases that actually happen.

The NSLogs are still there, just disabled. Maybe add in runtime switch or
something.
Add "line" and "linetext" stdin modes, and some more logging.
- general housekeeping
- updated readme, added section for TabAcceptsCompletion fixin.
- removed DisableWriteStateData fixin, since I don't use it any more (and I doubt anyone else does either)
- removed OptionClickDocumentation fixin since it broke with Xcode 4.5 (may re-implement it eventually)
- added check to XCFixin.m to prevent fixins from loading in Xcode versions < 3, which was apparently possible (and they end up crashing Xcode)
Updated readme
Updated readme
Updated readme
Updated readme
Toggle showing/hiding of distractions