Cleaned Xcode project

Organized linked libs/frameworks by platforms: Mac OS X vs iOS

Removed useless linked libraries -lz, libcrypto.dylib and libCommonCrypto.dylib (we get the last two through libSystem linked by Foundation)

Removed remnant references to Typewriter Supporting Files
Added BasicPersistence target for iOS

Fixed missing AppKit as a a linked framework in some targets.

Removed -lz for real this time.
Updated README, INSTALL.Cocoa and NEWS to discuss the iOS support