Clean up lute instruments in instruments.xml

[MarkusLutz63]

For lute instruments I think it is helpful to have the possibility to choose tablature in instruments.xml directly, as normally these instruments are notated in tablature (french or italian).
Also I think that it is not necessary to have for instruments with different course-number different instruments, as you always - or at least often - have to change the tuning of the basses. And if you don't need them, it doesn't harm imho. And it is very easy to delete not needed string in staff properties / strings.
So I have changed the lute instruments to the following:
lute (i.e. notation -> G8vb)
Rennaissance lute (French tab)
Rennaissance lute (Italian tab)
Baroque lute (i.e. notation -> G8vb, up to 14 courses!)
Baroque lute (French tab)
Archlute
Archlute (Italian tab, no french tab here!)
Theorbo
Theorbo (Italian tab)
Theorbo (French tab, used in France)

Probably for 5-course lute also tablature versions should be added, and it would be good to add mandora (late lute instrument in the 18th century, only with french tab).

If that is acceptable, I think it would be good to have that in 2.1 also, as the first question of a new user (I did some examples in musescore 2.1) was: how can I change lute to tablature?

[lasconic]

MuseScore 2.1 is released already. See announcement here: https://musescore.org/en/2.1

[MarkusLutz63]

;-) - I know that it had been released - I have already the release version.

But anyway that could be something, that could at least been changed if bug fixes have to be made.
It's a pity that I didn't find the time for this earlier, but profession and regarding musescore other necessary changes had been very time-consuming ...

[lasconic]

I'll merge this in master and 2.2. It would be great if lutists and sympathizers could test.

[lasconic]

@MarkusLutz63 Lutists did react https://musescore.org/en/node/207321 Please discuss there. I revert this PR for now.