Housekeeping - typecasts to avoid warnings and removal of redundant methods.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@2870 72102866-910b-0410-8b05-ffd578937521

Source/NSData.m

@@ -737,11 +737,6 @@ readContentsOfFile(NSString* path, void** buf, unsigned* len)
 	intBuffer[i] = NSSwapBigIntToHost (intBuffer[i]);
 }
 
-- (id) copy
-{
-  return [self copyWithZone: NSDefaultMallocZone()];
-}
-
 - (id) copyWithZone: (NSZone*)zone
 {
   if (NSShouldRetainWithZone(self, zone) &&
@@ -752,11 +747,6 @@ readContentsOfFile(NSString* path, void** buf, unsigned* len)
 	initWithBytes: [self bytes] length: [self length]];
 }
 
-- (id) mutableCopy
-{
-  return [self mutableCopyWithZone: NSDefaultMallocZone()];
-}
-
 - (id) mutableCopyWithZone: (NSZone*)zone
 {
   return [[NSMutableDataMalloc allocWithZone: zone]