Added a --repeat option for testing
Added repeat option to test()
Raise error if fits.open(memmap=True) is impossible.
Merge pull request #2298 from ChrisBeaumont/memmap

Raise error if fits.open(memmap=True) is impossible.
Merge pull request #3019 from astrofrog/repeat-option

Added a --repeat option for testing
Merge remote-tracking branch 'upstream/master' into amg/table-format-alignment