Describe the macros defined in #/Source/wali/graph/GraphCommon.hpp
Delete ancient Binrel_old files
Fixed some sanity checks in [un]set(Pre/Post) variants.
Change macros in BinRel. Check for value being 1 instead of ifdefs

This is safer -- avoids a misspelt macro being considered an undefined macro.
Also allows an easy check that at least one out of some optional macros is
defined.
Add Comments to code in AddOns/.../binrel/
Merge branch 'master' of https://github.com/WaliDev/WALi-OpenNWA
Add comments to ast.h