[Ifeffit] problem compiling ifeffit 1.2.8

[Matt Newville]

Hi Igor,

Thanks.   That was technically an error in ifftest1.f (that is, a main
'program'  cannot do a 'return') that g77 thought was OK but ifort
sems to have caught.  I'll fix it in the next release and look for
other illegal 'return's.

--Matt