optimized dimension_options sparql query
Merge branch 'hotfix' into devel
sparql for intervals
Added test for dimension_options_xy returning no result
Sparql queries optimizations for dimensions
Merge branch 'hotfix' into devel

Conflicts:
	edw/datacube/data/cube.py
Removed set_trace from ajax_test.py
Merge branch 'hotfix' into staging

Conflicts:
	edw/datacube/data/cube.py
Merge branch 'devel' into staging

Conflicts:
	edw/datacube/data/cube.py