* lang_php/analyze/foundation/graph_code_php.ml: remove parsing cache,
add list of things to do in env, rename add_node, add phase param
to use_edge
* lang_php/analyze/foundation/graph_code_php.ml: use phase_inheritance,
remove one parsing step
* lang_php/analyze/foundation/graph_code_php.ml: estet
* lang_php/analyze/foundation/graph_code_php.ml: move uses outside
* lang_php/analyze/foundation/graph_code_php.ml:
* lang_php/analyze/foundation/graph_code_php.ml: put back TODO