basic code for graph generation
improve graph-based argcheck algorithm
graph-based: first working version (ordered arguments only)
handle lua 5.2 bit lib
support for named arguments
removed the old C graph attempt
added support for overload (ex-chain)
added support for quiet
fix default when value is boolean
added support for user-specific checks
check for ambiguities (added force flag too for insane users)
removed one useless specific case
various debug cleanup
cosmetic changes to generated dot graph
integrated support for doc
fix bug when assigning head rules in a new path
updated the doc
added a test suite
fix some doc
doc