added stringByReplacingOccurrencesOfString:withString: (GNUstep-only, it's missing there).
added stringByReplacingOccurrencesOfString:withString: (GNUstep-only, it's missing there).

alloy/nu,nulang/nu,gcbeyond/nu,jqk6/nu,heiko-henrich/nutor,timburks/nu,nulang/nu,gcbeyond/nu,spotify/nu,jqk6/nu,heiko-henrich/nutor,spotify/nu,heiko-henrich/nutor,timburks/nu,hodgeswt/nu,spotify/nu,heiko-henrich/nutor,timburks/nu,alloy/nu,hodgeswt/nu,jqk6/nu,spotify/nu,jqk6/nu,gcbeyond/nu,hodgeswt/nu,hodgeswt/nu,nulang/nu,gcbeyond/nu