TR1 math and documentation patch

[Smith-Rowland, Edward M]

This patch fixes some doxygen issues with the TR1 special functions.
The progress chart is updated to reflect completion of special functions.

I also checked off a lot of regex.  It looks like this is mostly or all done.
Folks who know more about this might give this a look.

There are two substantive things: some constification and a change to allow the branch point x=1 in the hypergeometric function.


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