Log Message:
- SQL files are used by scripts and PHP code to create/update the
  database, and they are looking for them directly under INSTALL_DIR.
  As such, move them to RCDIR.

- install bin/ scripts with --x rights.

Package not bumped. All these changes do not affect roundcube besides
installation and update. If your roundcube install works already, chances
are you have adjusted the package in a way similar to this patch.