Adding augmentation dots

To obtain dotted note lengths, simply add a dot (`.') to the number. Double-dotted notes are produced in a similar way.

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=171

{
  a'4 b' c''4. b'8
  a'4. b'4.. c''8.
}