Revert "Issue #1995018 by hefox, seanB, abautu: Show child groups when creating content when og_group_ref/og entityref field is using og group selector"

This reverts commit 17c35018.

This reverts commit f6ea13d4.

abautu authored Sep 11, 2015 and Mike Potter committed Sep 11, 2015

Issue #1995018 by hefox, seanB, abautu: Show child groups when creating content when og_group_ref/og entityref field is using og group selector

Hunter Fox authored Sep 11, 2015 and Mike Potter committed Sep 11, 2015

Issue #2447683 by hefox: Better performance for sites that have few parents but many children several levels deep

Hunter Fox authored Jul 23, 2015 and Mike Potter committed Jul 23, 2015

Issue #2446943 by hefox: Use direct db_select instead of entityFieldQuery in og_subgroups_get_associated_entities

Issue #2124487 by totolearn: Cannot going Space: using PostgreSQL getting PDOException：SQLSTATE[22P02]:.

Revert "Issue #1995018 by hefox: Added Show child groups when creating content when og_group_ref()/og entityref field is using og group selector."

This reverts commit 21f7a461.

Issue #1995018 by hefox: Added Show child groups when creating content when og_group_ref()/og entityref field is using og group selector.

Initial commit for branch 7.x-2.x that includes patch from http://drupal.org/node/1536178#comment-7133760

Checking if module og_access exist to view permission, also working on new simple test for the new functions 

Modified a case of node view access, when the node content is set to default access, treat as private if permmision was alreaty set in the grant array. 

Added hook_node_access_records_alter() to allow view permission to a user subgroups, even if he's not member of the sub group.
Also I extended og_subgroups_get_reverse_hierarchy_tree_perm() function to return the reverse tree structure with level information.