Detailed Description

-01-preparelocaldb
Script to prepare a local database for HLT validation.

This is more complicated as we would like because performance of HLT depends on
the payloads matching to the given run but we also want to valdiate new payloads
and/or new software versions. So as a "best guess" what could work we take with
the following priority

1. any payloads in online that are unlimited.
2. any payloads in online valid for the validation run but no longer unlimited
   *if* a payload with the same name still exists as unlimited in the online tag.
3. any payloads in staging_online

We take all of these and put them in a local database file and download all the
necessary payload files.