Lunch time break.
Added init function for Artin reps.
Corrected some mistakes
Add general tensor_get_an()
Merge branch 'master' of https://github.com/MarkWatkins2014/lmfdb into mine

* 'master' of https://github.com/MarkWatkins2014/lmfdb:
  Add general tensor_get_an()
merge with ber2