[#252] Check_access helper function does not need data_dict supplying
[#252] Only show add related item button if permission to add
Merge branch 'master' of github.com:okfn/ckan into 252-related-item-button-fix
[#252] Delete "Add Related" link from dataset page

The "Related" sidebar box on the dataset page has both an "+Add Item"
button and an "Add Related" link, seems only one is necessary.
Merge branch '252-related-item-button-fix'