* Headers/AppKit/AppKit.h: Add NSPopover.h to set of files
	included.
	* Headers/AppKit/NSApplication.h: Add NSApplicationDelegate.
	Inherit from GSAppDelegateProtocol.
	* Headers/AppKit/NSPopover.h: NSPopover header.
	* Source/GNUmakefile: Added NSPopover.[hm]
	* Source/GSXibLoader.m: Translate NSCustomView to NSView when
	unarchiving.
	* Source/NSPopover.m: Skeletal implementation of NSPopover.m.



git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@36552 72102866-910b-0410-8b05-ffd578937521