Refactor the CSV-based databases

Merged Amir MOHAMMADI requested to merge refactor-csv-database into master

This new format of CSV databases fixes the following issues with the old format:

  • There is a clear distinction between subject_id (which is the identity of the person behind a Sample) and template_id (which is the unique identifier of a biometric template, for both enroll and probe SampleSets)
  • Implements sparse scoring through a separate for_matching.csv file. In the old format, this was possible through hacks only.
  • Removes the SampleLoaders
  • The implementation is based on the one in bob.pipelines
Edited by Yannick DAYER

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