* lang_clang/analyze/graph_code_clang.ml: do not use edges for dupes
* lang_clang/analyze/graph_code_clang.ml: try expand typedefs
* lang_clang/analyze/graph_code_clang.ml: improve dupes for children of dupes,
do not care about typdef deps, rename local constants
* lang_clang/analyze/graph_code_clang.ml: comment
* lang_clang/analyze/graph_code_clang.ml: kind_file, more tolerant
* lang_clang/analyze/graph_code_clang.ml: no deps when dupe typedef or proto
* lang_clang/analyze/graph_code_clang.ml: special case USED and SET for plan9
* lang_clang/analyze/graph_code_clang.ml: handle duped globals, implicit
extern