Clean up unneeded alt txt; rework "Add to my list"

Clean up unneeded alt txt; rework "Add to my list"

1: Set blank alt text attrib on non-functional images; also remove
alt text on images that's duplicated by adjacent link text.
This reduces clutter text browser and screen reader users.  More:
http://universalusability.com/access_by_design/images/irrelevant.html

2: Make "Add to my list" use a styled link instead of an image & button,
like the "Place Hold" link next to it.  This lets us remove the duplicate
alt text, makes the two items operate in the same way, and makes the
presentation code more similar between table.tt2 & record/summary.tt2.