verbosity on database creation needs fixing

Created by: anjos

There is a small error on the way verbosity is counted on https://github.com/bioidiap/xbob.db.gbu/blob/master/xbob/db/gbu/create.py, line 253. You should replace:

  parser.add_argument('--verbose', action='store_true', default=False,
      help="Do SQL operations in a verbose way")

with

  parser.add_argument('-v', '--verbose', action='count',
      help="Do SQL operations in a verbose way")

This would allow multiple levels of verbosity to be taken into account correctly.

Also, double-check other modules you maintain do this correctly.