[MIN] GUI Editor, Ctrl-K: consider spaces when uncommenting code
[MOD] XQuery: Use `return` instead of `throw` for tail-call elimination.
[MOD] Separate tail call into separate method.
Merge pull request #871 from LeoWoerteler/ret-tco

No More Exceptions for Tail-Calls
Merge branch 'master' of github.com:BaseXdb/basex
[MOD] GUI, Project View, Ctrl-H: filter by currently opened file type
[FIX] Commands, REPO INSTALL: do not delete existing files in pkg dir.