Script updates and minor bug fixes

This release corrected script files that had not been pushed up to the repository with the original release. It also includes minor bug fixes notes by S. Harmsen and C. Cramer that affect periods other than PGA, 5-Hz, and 1-Hz. One input file was also modified (it was missing the line specifying the number GMPE's for PGA); this error has a negligible effect on hazard.