* Source/include/NSString.h: declaration of categories:
NSString (GSString)
NSString(GSTrimming)
NSMutableString (GSString)
NSMutableString (GSTrimming)
* Source/NSString.m: implementation of these categories
* Source/include/NSObject.h: added ASSIGNCOPY
Same as ASSIGN but copy the value
* Source/include/NSURL.h: New class
* Source/include/NSURLHandle.h: New class
* Source/NSURL.m: New class [see the note in the file]
* Source/NSURLHandle.m: New class [see the note in the file]
* GNUMakefile: added NSURL.m and NSURLHandle.m
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@3699 72102866-910b-0410-8b05-ffd578937521