[FIX] GH-658: Evaluate XQUnit tests in the correct scope.
[MOD] Static functions aren't expressions.
[FIX] XQuery, GH-657: Better detection for undefined variables.
[FIX] XQuery, GH-659: Better error description for node tests (e.g. `element(foo)`).
Merge pull request #669 from LeoWoerteler/gh-659

[FIX] XQuery, GH-659: Better error description for node tests (e.g. `element(foo)`).
Merge pull request #667 from LeoWoerteler/gh-658

Static Function Refactorings
Merge pull request #668 from LeoWoerteler/gh-657

[FIX] XQuery, GH-657: Better detection for undefined variables.
[FIX] XQuery, format-date/time: output of fractional seconds ([f])
[MIN] renaming
[FIX] XQuery, resolve-uri(): base URI checks added
[FIX] XQuery, serialize-xml-009: error code updated
[FIX] XQuery: annotation namespace and error codes updated
[FIX] XQuery, annotation parsing errors revised