feature request: Hairpin.hairpinFullLength

[Graham Percival]

(this'll probably get lost while HWN is away, but anyway...)

From the docs,
"A hairpin starts at the left edge of the beginning note and ends on 
the right edge of the ending note."
----
tupletFullLength (boolean)
    If set, the tuplet is printed up to the start of the next note.
----

Could we have a feature, similar to tupletFullLength, which places the 
end of a hairpin just before the start of the next note?

In addition, could we allow this as valid syntax?
{
  c1\<\!
}


Cheers,
- Graham