Periods in DSS filename

[eheisman]

Note, the internal DSS code that retreives a catalog cuts off filenames at the first period, so "test.dss" and "test.foo.dss" both use the catalog file "test.dsc". If there is a period in the file name, it will always be necessary to update the catalog file before requesting data.

TODO: Add check into getPaths function to check for this case when reading the catalog file, and refresh catalog if this is the case.