Quickmagic: add picture of save-WD/revert-WD functionality
QuickMagic: restructure so that QuickMagic main frame calls both ErMagicBuilder and Check.  This allows the main frame to "talk" to both.
QuickMagic step 3: fix add_sample and add_site functionality so that it actually works
QuickMagic: fix up save/revert WD option