Merged requested to merge bugfix/regressions-ter-db-merge into develop
Two changes are needed since the unification of the database tables
When an extension version is uploaded or removed, the *_extension table needs an update (which was not the case before) with the current version information. For this reason the "ExtensionKey" API has a "UpdateExtensionInformation" method now, and some internal functions are moved to the ExtensionKey class
When an extension version (or extension) is deleted, Extbase attempted to also delete the information (which already happened in the TER)
The SolR Re-Indexing is now placed at a more central point.