Plugins link on account management now always takes you to plugins.

This addresses issue #1486.

Two things I wasn't sure of:

1) Is this a good idea?  Because the tabs work by loading the whole page and then dynamically hiding and showing divs, solving this requires loading both the current plugin and the list of plugins at once OR making the navigation/tab javascript and/or template a lot more complicated to know whether it's currently in plugin vs plugin list mode.

2) Whether including that very view-specific javascript in the template (in the existing jquery.ready(), though) is the best place for it to go.