Highlight "Recommended" when Latest also present

This simple patch adds an extra class if there is a recommended and a latest, and that class gets the bolding. Recommended version doesn't fit in 13em if bolded, so width expands to 14em to accomodate.

dww wanted this to also highlight if a 'security update' is listed and not used. That was an easy enough change, and committed.

Here's a slight addendum based upon dww's comments via IRC. It highlights the security update IF there isn't a recommended version being listed next to it.

Since #3 introduces an else clause to that funky special case that used to be written with inverted logic, it's actually much clearer to re-write the if. Attached patch does that, and also includes the conditional bold if there's both "Recommended" and "Also available".

merlin gave his blessings for #5 in IRC, so I committed to HEAD.

FYI -- there was a bug where we weren't bold'ing Recommended if we were just displaying that and a dev snapshot. Fixed: http://drupal.org/cvs?commit=71470

Also, in IRC, UnConeD and hunmonk suggested another visual enhancement to make the recommended line stick out and be more visually clear, even if there's only that 1 line. A subtle zebra stripe sort of thing with a slighly lighter shade of the color. Screenshot here from garland.

Same, but screenshot with marvin enabled.

And now, the trivial patch (just touches update_status.css).

Committed to HEAD (http://drupal.org/cvs?commit=71473). We can always tweak later if we must, but this is an improvement, IMHO.