[Ifeffit] maximum number of paths in Artemis

[Matt Newville]

Yuan,  All,

I put several Windows dlls for Ifeffit at
     http://cars9.uchicago.edu/~ifeffit/src/Win32_dlls/1.2.12/

There are versions there with 256, 512, 1024, and 2048 paths.    I
have not tested these beyond loading them, and running a trivial
python script.  Please let me know if there are problems.

Unfortunately, as far as I can tell, Athena and Artemis uses a
built-in dll, and will not use this newer one.

--Matt