Changes to the data read-in logic

A general set of changes to the data read in logic, adding functionality and changing functionality

1. In previous versions, the "fetch_open_data" was provided as a fall back in order to help users. After some consideration, this looks like it just confuses people more often than it helps. As such, the fetch open data fall back is discarded.
2. Adds the option to specify a dict like {H1:GWOSC} to force the use of the GWOSC open data
3. Adds an error message "Failed to obtain data" and "Obtained data is all zeros" for common data get problems
4. Fix bugs in the data quality checks
5. Add the option to point to a collection of gwf files, if * is in the data-dict, the path will be globed and passed in
6. Adds the option for the gps-file to have multiple colums. All but the zeroth column are ignored, but it may be useful to users to keep meta data