Added an override (hold down shift and control when opening tradeskill) that will open the standard

Added an override (hold down shift and control when opening tradeskill) that will open the standard
frame instead of Cauldron, and corresponding command-line switches to enable/disable Cauldron.
Added a bag scanning function so that the item deltas function is more reliable.
Added some merchant scanning functions in preparation for the auto-buy functionality (and the button
is now temporarily removed from the shopping list window).
Updated the pkgmeta file to include WoWUnit, so that I can do unit testing (yay!).
Added a stub unit test file for the unit tests that will be coming soon.