[v3] tr1 special math functions

[Benjamin Kosnik]

Ed has graciously donated an implementation of many TR1 special math 
functions. This is an impressively large effort, and has been refined 
over a process of months.

There is still work to do: numerical programmers who are interested are 
encouraged to help with this effort.

... as committed.

tested x86/linux
tested ppc64/linux
tested x86_64/linux
tested w/ --disable-c99

-benjamin