Undo button not loading correct cached table

[marshallmcdonnell]

If you:

• Load a table (in --mode idl)
• Right-click to Clear a row
• Right-click to Undo a row

you will notice that not all the fields are repopulated. Doing this cycle over an over reveals that the cached state of the table is out of sync, reloading fields in rows or entire rows it shouldn't be.

The methods [save_table and load_table] for this functionality is located at addie.processing.idl.undo_handler.UndoHandler