do not optimize away non-deterministic functions
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2
fixed several AQL tests
attempt to fix infinite ranges in skiplists
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2