Adds BAD_PRACTICE and SECURITY to bug categories

(Just like FindBugs proper)
Improves FCBL_Sample

Adds some tags about what should and should not be detected.
Additionally adds a few cases (like nested ifs).
Simplifies and documents SillynessPotPourri

I extracted a lot of the methods and added some documentation.  It was
getting very heavyweight, otherwise
Fixes howto link
Merge pull request #30 from kjlubick/cleanup

Misc Cleanup