Log Message:
Changes 2.4.4:
* Fix bug: inappropriate Volume purging.
* Modify sql_update.c to edit zeros rather than NULL in unset fields.
* Backport most recent changes to compat.h and compat.cpp
  attempt to fix restore problem with accents in path. This
  works in version 2.5.x but is not tested in 2.4.4.
* Create and apply 2.4.3-migrate2.patch, which fixes two bugs
  - sql error when there are no files to migrate.
  - Job catalog log is not migrated during migration.
* Remove extra db_lock() in get_prune_list_for_volume()
* Apply 2.4.3-prune-deadlock.patch that fixes a problem when
  using Catalog as message backend.
* Apply 2.4.3-win32-runscript-unicode-path.patch for a problem when
  executing a program with Unicode path.
* Apply 2.4.3-unique-inchanger.patch fix bad slot number if the volume
  is not in autochanger.
* Fix for bug where Volume is purged while writing on it.
* Get message enhancement to avoid job name lookup.
* Fix bug with job name duplication if more than 60 jobs created
  during a minute.
* Correct some bugs of cleanup in SD if the FD connection fails.
* Fix orphaned jobs (possible deadlock) while pruning.
* Backport of the btraceback script that keeps trace file on working dir
* Migrate DB Log records too.
* Modify SQL so that jobs that failed will not be migrated.
* Correct bug where long retention periods caused immediate pruning.