[Tapper-develop] Serialization works

[Greg B. <gbr...@ho...>]

I can now create a tuning and close Tapper.  When I re-open Tapper I can
see the tuning in the list of available tunings.  However, I don't have
the code to edit an existing tuning yet.  Once that's done We can verify
that tuning serialization truely works.

Also, I've discovered that I need a delete button for my test tunings.
The current gui has no way to remove an existing tuning.

Note for future development: Add a function to merge in other people's
tunings.  That way somebody can enter, for example, 32 different Sitar
raga tunings and other users can import them.

Greg A.K.A. Dru Lee Parsec