Update to latest Xcode-recommended build settings
Add a new build target using the 10.6 SDK for easier backwards compatibility checks
Fix framework search paths for recent Xcodes, in a hopefully-backwards-compatible way...
Add a .gitattributes file containing config and instruction on how to easily diff UTF16 .strings files (the actual .gitconfig itself can't be included in a repo), and update localizable strings file
Fix string formatting warnings in NSRunAlertPanel by using the additional arguments
Fix a loss-of-precision implicit conversion warning