Changed free() calls to vect_free() calls in explorefft.c
Fixed bug where zapbirds was trying to zap 0 bins.
Merge pull request #18 from pscholz/master

Fixed zapbirds bug
Added off-pulsed reduced chi^2 estimation function
Added -fixchi flag for show_pfd
Added -fixchi to prepfold
Merge branch 'master' into pfd_improvements
Merged pfd_improvements and fixes in master