ObjC: added some thoughts about using NSInputStream

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: debug print of scopestack

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: fixed -description of tree nodes with atrributes

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
ObjC: clarified code for handling command line options

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
fixed using initial argv[0] for detecting the compiler

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>