[Ifeffit] update to ifeffit source kit

[Matt Newville]

Hi Folks,

I found a serious bug in the ifeffit-1.2.11 source code kit that was
on the cars.uchicago.edu and sourceforge.net sites.   This bug would
become readily apparent, as many operations beyond the simplest tests
will not work correctly, so like any actual use of Athena would be
clearly wrong.  Sorry for any trouble!

I uploaded a fixed source code kit (ifeffit-1.2.11a.tar.gz) to both
the cars.uchicago.edu and sourceforge.net sites.

This bug does not affect the Windows binaries.

--Matt