Return list of signed integers representing the intervals between each of the elements in pitch_carriers.
Behavior of wrap:
abjad> staff = Staff(construct.scale(8))
abjad> print staff.format
\new Staff {
c'8
d'8
e'8
f'8
g'8
a'8
b'8
c''8
}
abjad> pitchtools.get_signed_interval_series(t)
[2, 2, 1, 2, 2, 2, 1]
abjad> pitchtools.get_signed_interval_series(t, wrap = True)
[2, 2, 1, 2, 2, 2, 1, -12]
abjad> notes = construct.scale(8)
abjad> notes.reverse( )
abjad> notes
[Note(c'', 8), Note(b', 8), Note(a', 8), Note(g', 8), Note(f', 8), Note(e', 8), Note(d', 8), Note(c', 8)]
abjad> pitchtools.get_signed_interval_series(notes)
[-1, -2, -2, -2, -1, -2, -2]
abjad> pitchtools.get_signed_interval_series(notes, wrap = True)
[-1, -2, -2, -2, -1, -2, -2, 12]