sortmerna: finish update

[bernt-matthias]

followup on https://github.com/bgruening/galaxytools/pull/1316 which was not deployed

ping @bgruening

• use the same chached data for chached and cached_to_index i.e. now they differ only in that the later uses the dbprep macro

  if I get it right previously the datamanager precomputed indexes which could be used. this seems not possible anymore

  I suggest to leave the dm untouched (than the provided data will also work for old sortmerna versions)

• fix usage of cached data (did not work for multiple provided values) and add tests

[bgruening]

Tests are failing here now :(

[bernt-matthias]

Hrm. toolshed is in bad mood today.

Unexpected HTTP status code: 400: {"err_msg": "You do not have permission to update this repository."}
Unexpected HTTP status code: 403: {"err_msg": "You are not the owner of this repository, so you cannot administer it.", "err_code": 403005}