Created a chisq macro, documented it, updated docs

I needed a macro to run chisq analyses. So I created on, then updated
the documentation via DocItOut.
Moved the gee macro into its own file, added doc, updated doc

I moved the gee macro into its own file as I am slowly moving my
macros so that they are as a SAS autocall library.  I renamed the
For.sas file to for.sas as the autocall library wasn't picking up the
uppercase F.  Added documentation to the gee.sas file.  Updated the
documentation.
Added reference pdfs for coding and commenting
Updated README (more detailed, style section), updated TODO