Remove fixed column sizes on manage policies page.

See
https://github.com/RequestPolicyContinued/requestpolicy/pull/459#issuecomment-54340418
Rename 'Source' column to 'Policy List' in manage policies page.

See
https://github.com/RequestPolicyContinued/requestpolicy/pull/459#issuecomment-54340418
Remove delete button for read only policies.

See
https://github.com/RequestPolicyContinued/requestpolicy/pull/459#issuecomment-54340418
Revert back to having single deleteRule function instead of attaching a new one to each click()

See
https://github.com/RequestPolicyContinued/requestpolicy/pull/459#issuecomment-54340418