Ahaggar: add more node types

Currently these are commented

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Ahaggar: add the POSTINCREMENT_EXPR and POSTDECREMENT_EXPR walker

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Ahaggar: call the POST(INCREMENT|DECREMENT)_EXPR walker

Signed-off-by: Djalal Harouni <tixxdz@opendz.org>