New figured bass capabilities and some request

[Matevz Jekovec]

Hello to all developers!

I'm pretty excited about the new extender lines features in figured bass
code. I'd like to comment them and maybe give some advice and request
for minor enhancments and fixes over the current code:
1) The extender lines are usually used for figuration, rearrangment and
other operations on the *same tonal function*. Now, there are occasions,
where you need to write the number itself again under the notes and NOT
to use the extender line. One of the solutions is of course, to use

  \set useBassFigureExtenders = ##f

and then

  \set useBassFigureExtenders = ##t

But in practice, you have about the same amount of extended and
non-extended markings and switching them all the time this way is a bit
space consuming. My question is, is there a way to add an extender line
manually on certain chords? I have something like eg. <6 5> <6 4> for
unextended 6th and <6 5> <6_ 4> for the extended 6th in mind. I think
this wouldn't be too difficult to implement, if it's not yet possible.

2) The thirds for the stable chords are usually completely ommitted in
practice. In case there's an accidental before the third, only the
accidental itself is shown, without the number 3. Is there a way to use
+/- alteration markings as an independent element? eg. This example
would show the sixth released to fifth and with lying sharp below: <6
+>  <5 +_>.


Regards.
- Matevž

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