[FIX] XQuery Update: AIOOB When Updating Fragments. Fixes #736.
[MOD] RESTXQ, better handling of multipart/form-data.
      Details: http://docs.basex.org/wiki/RESTXQ#File_Uploads
[FIX] XQuery, GH-738: Variable uses not counted correctly in `case`.
Merge pull request #739 from LeoWoerteler/gh-738

[FIX] XQuery, GH-738: Variable uses not counted correctly in `case`.
[MOD] #736: replaced old testcase with deterministic one