Component Config Page: Related Rule Tabs

When editing a rule, it would be neat to be able so see and switch to other rules with the same tag.

* When editing a reaction rule (or Rules component, I guess), you get the usual content in the main area – events, conditions and actions.
* On the left is a set of vertical tabs, showing all other reaction rules (or Rules components) with the same tag. One tab per reaction rule/component – click on tab to view its configuration.
* Below the tabs is a link to clone the active reaction rule/component.
* Below that is another link to create a new reaction rule/component, that has the tag prepopulated with the tag you're currently viewing.

Nothing was said about how to deal with multiple tags, though. If a reaction rule has tag A+B, should both A and B reaction rules show, or only reaction rules with both A and B tags?

(Originally from Itangalo's comment in #1495552-7: [Meta] Improve overview page and notes from Rules UX BoF.)