fold_psrfits: Fix tsubint calc error (installed at GB 08/20/2011).
Fixed an integration determining bug (by Paul Demorest)
Changed mpimerge to use gethostbyname()
Merge branch 'master' of git://github.com/scottransom/psrfits_utils
mpimerge: Fix poln ordering bug for scales/offsets.
mpimerge: add "VEGAS mode"
Fixed conflicts from VEGAS merge from Paul