registry_rebuild 7.x-2.0

# Fixes and improvements available only in 7.x-2.0

* #2111851: Improve Drupal API use to better support core versions and compensate API differences
* When --no-cache-clear is used, make sure the rebuild is done again in DRUPAL_BOOTSTRAP_FULL
* Sync improvements for lock.inc logic in the PHP script to match Drush variant.
* Improve some messages and comments.

# Other fixes included also in 7.x-1.11

* Add support for absolute path defined in lock_inc variable. Use single 'else' fallback only.
* Truncate also cache_form table/bin, normally excluded in Drupal API.
* Make sure that the configured lock.inc really exists and is a file.
* Skip files checks if lock_inc is empty/not set.
* Fix for Drupal API compatibility.
* Clear all caches before running aggressive rebuild with --fire-bazooka to avoid errors.