#1235994 by das-peter: Allow to use the value to groupby, so you can use rdf. This changes the api but handles it in a backward compatible way.\n Additional add some documentation and some tests for that feature.

Revert "#1199328 by casey, bojanz: Add typehintings to every place which doesn't break the api. KUDOS"

This reverts commit 553f0e80.

#1270982 by drunken monkey, dereine: Allow to specify entity type on non-base-tables, which allows some fancy views integrations like a generic entity views integration

#1101506 by djebbz, dereine: Provide a admin/reports/views-fields which list all fieldapi fields used in different views

Issue #470258 by joachim after more than a year of work: Groupwise representative relationships. Or subquery relationships.

Conflicts:

	help/views.help.ini