Query hydrate: update_original_relation only for relations concerned
Merge branch '1.8/develop' into bugfix_update_original_relations
dont use a frozen object from cache when hydrating
Only update original relations with imploded PKs of not new objects

Signed-off-by: Andrew Wheal <andreww@propcom.co.uk>
extra checking on updating original relations
Merge pull request #333 from propcom/bugfix-frozen-hydration

Don't use a frozen object from cache when hydrating
Merge pull request #312 from felixgilles/bugfix_update_original_relations

Query hydrate: update_original_relation only for relations concerned
do not cache the new object if we already have on (but it's frozen)
make sure $frozen has a value
revert PR #328
Merge pull request #328 from propcom/bugfix-original-relation-blank-ids

Only update original relations with imploded PKs of not new objects