Define default allowed values for og group access field.
Fix notice when trying to hide node view tab.
Merge pull request #5013 from openscholar/5012

Fix notice when trying to hide node view tab.
Merge pull request #5009 from openscholar/5001

Define default allowed values for og group access field.
fix block node margin bottom when node is last one. #4956
Set correct example for the base domain URL in the default install script.
Merge branch 'SCHOLAR-3.x' of github.com:openscholar/openscholar into SCHOLAR-3.x
Merge branch 'SCHOLAR-3.x' into 4814