[FIX] remove potential pitfall regarding ID overflows when updating fragments
Merge pull request #844 from LukasK/fixes

[FIX] remove potential pitfall regarding ID overflows when updating frag...
[MIN] cleanup
[FIX] XQuery, Options: convert text nodes to string value. Fixes #845
Merge branch 'next' of github.com:BaseXdb/basex into next
[FIX] XQuery, node id: support integer overflow when comparing ids