explain tests
re-enable test; its working now.
UnitTests: divert to AQL2 in the modifying  queries tests; adjust to new reply-syntax.
use RANGE AqlValue type
Add code coverage files to cleanup process
Merge branch 'aql2' of github.com:triAGENS/ArangoDB into aql2
added range test
Merge branch 'aql2' of https://github.com/triAGENS/ArangoDB into aql2
removed "old" AQL function
Instanciate expressions for variable bounds.

And various cleanups.
Merge branch 'aql2' of ssh://github.com/triAGENS/ArangoDB into mmh

Conflicts:
	arangod/Aql/ExecutionBlock.cpp
	arangod/Aql/Query.h
Fix test for new IndexRange behaviour.