HR-221 - Display links for editing OptionValues as a dialog

DO NOT MERGE YET.

This is proof-of-concept based on experimentation with @colemanw. Issues:

 * It doesn't address all the pencil icons in all the tabs.
 * The "Enable/Disable" links in the popup misbehave.
 * The 4.5 stuff is still new - may change.

See also: http://issues.civicrm.org/jira/browse/HR-221