Nuclear Accent / Main Stress

[nkalivoda]

An extension of issue #514, which makes each minimal φ (or more generally, recursive cat) either left- or right-headed: Provide option to mark exactly one head-terminal as the main head.

In #514, I gave this example:

LL: (ώ ω) (ώ ω)
LR: (ώ ω) (ω ώ)
RL: (ω ώ) (ώ ω)
RR: (ω ώ) (ω ώ)

If the proposed option were selected, then we'd get:

L.LL: (ώ ω)* (ώ ω)
L.LR: (ώ ω)* (ω ώ)
L.RL: (ω ώ)* (ώ ω)
L.RR: (ω ώ)* (ω ώ)
R.LL: (ώ ω) (ώ ω)*
R.LR: (ώ ω) (ω ώ)*
R.RL: (ω ώ) (ώ ω)*
R.RR: (ω ώ) (ω ώ)*

This will serve two purposes. When dealing with ω/φ, it can be interpreted as marking the nuclear pitch accent and/or main stress in the ι. When dealing with σ/Ft, it can be interpreted as primary stress.