V.2.0 upgrades

Here is an attempt to fill inn the gaps of the upgrades from v.1.x to v.2.0.

Running alembic after applying these on a master installation, gave the following output:
https://gist.github.com/jalavik/66d909e00d12ee2be3fe

Most of it are not applicable, except maybe the column change in the `tag` table, but I am not sure if this one is necessary..

Touches #1613
Yeah, so this upgrade adds the column so that existing master installations are compatible with the *pu/next* model. Basically following the algorithm:

1. install *pu/next*
2. inveniomanage upgrader run
3. master tables are now compatible with pu models.