[ADD] live from the 'Schwarzwaldbahn': db:backup, db:restore
      * added XQuery db:backup, db:restore functionality
      * re-worked XQUF module write-lock handling
[ADD] XQuery, XQuery Module: "memory" option added
[FIX] XQuery: stopping running queries
[FIX] WebDAV: fixed XQuery variable binding
[MOD] IntelliJ: updated IntelliJ project files
[MOD] HTTP: changed Jetty dependency scope to compile
Merge pull request #893 from dimitarp/webdav-binding-fix

Webdav binding fix
Merge branch 'xq-backup-restore-squashed' of https://github.com/LukasK/basex
[MIN] Save actions: remove whitespaces
[ADD] XQuery Module: db:backup, db:restore
[MIN] Allow hiding of field names in constructors (allow "this."...)
[MOD] XQuery: db:drop is executed before db:create again
[ADD] XQuery, Database Module: drop-backup, alter, copy. #870
[FIX] XQuery: Perm=NONE: no permission to resolve file paths
[FIX] Commands, RESTORE: drop old database before restoring new one
[MIN] XQuery, RESTXQ: fixes, better error feedback
[MOD] XQuery: Little Gauss (partial sum) calculation
[FIX] Client/Server: suppress/enforce serialization of XML entities
[ADD] Commands: new concurrency test
[FIX] XQuery: include context item declaration in locking check