AscatNrtBufrFileList read_period method fails to parse dates

[MartinSchobben]

When using read_period of the AscatNrtBufrFileList class, the inherited ChronFiles class _parse_date is used instead of the newly defined version. This causes an error when selecting the files.

[claytharrison]

Can you give more details on the error? This is actually the intended behavior, the _parse_date on this class should actually have been removed as obsolete after a restructuring of these classes last year. ChronFiles' _parse_date should in theory get everything it needs based on AscatNrtBufrFileList._fmt and the filename_template defined in AscatNrtBufrFileList.__init__, but I guess that's not happening correctly.