[ADD] live from the 'Schwarzwaldbahn': db:backup, db:restore
      * added XQuery db:backup, db:restore functionality
      * re-worked XQUF module write-lock handling
Merge branch 'xq-backup-restore-squashed' of https://github.com/LukasK/basex
[MIN] Save actions: remove whitespaces
[ADD] XQuery Module: db:backup, db:restore