Code organisation merged

[Andy Seaborne]

The code reorganisation PR has been merged:

Discussion:
https://lists.apache.org/thread/t0vc68mbo3kyq6l6qh1p3tmg31q3b66q

For code forks, the changes

  jena-tdb -> jena-tdb1
  jena-db/jena-tdb2 -> jena-tdb2

will impact IDEs.

    Andy