Revert "src/LocalPath.cpp: Changed XCSoarData folder destination for iOS devices"

This reverts commit f205037fa8914730ee502dc8252552d9be118ace. Supporting data
synchronization with iTunes is an excellent idea, but this change made XCSoar
use /var/mobile/Documents as the data folder, not the Documents folder within
the application sandbox. And iTunes data synchronization is not implemented yet.
Remove CFBundleDevelopmentRegion setting from Info.plist

The CFBundleDevelopmentRegion setting seems to be unnecessary.
Set UIRequiredDeviceCapabilities in Info.plist

Specify armv7 and opengles-2 as required capabilities for the iOS app.
Set LSMinimumSystemVersion in Info.plist

Specify iOS 5.1.1 as the oldest supported version
Specify the iOS app as iPad compatible

Specifying the values 1 and 2 for the UIDeviceFamily settings in the
Info.plist means that the app is designed for iPhones and iPads.
This prevents the iOS app from running in the iPhone compatibility
mode on iPad devices.
Makefile: Use gzip compression for the Cydia deb package

Current dpkg-deb versions emit a warning that using the bzip2
compression algorithm is deprecated.
doc: "OS X" instead of "Mac OS X"

Since version 10.8, the there is no Mac prefix in Apple's operating
system name any more.
doc: Add OS X / iOS build dependencies

Document png2icns and dpkg as dependencies to build for OS X / iOS
Merge branch 'master' of git://git.xcsoar.org/xcsoar/felix/xcsoar
Thread: use nullptr instead of NULL