Review model spreadsheet format

[davidhassell]

• [x] remove "required" and "cardinality" columns
• [x] add a * (star) to a property name if required (i.e. 1.1 or 1.N)
• [x] expand text area for L-STR types
• [x] Add CSV list for CS-STR
• [x] replace pull down menus by radio/check boxes to avoid the adding of extra lines (including "Other:")
• [x] Add "feedback" column
• [x] reduce visibility of specialization ids