`histpos.t`

builds the matrix of observable capture histories in terms of captures and misses for a capture-recapture
experiment with `t`

capture occasions.

`histpos.0`

builds the matrix of observable capture histories in terms of number of captures for each primary period of
a robust design with `vt`

capture occasions. For closed populations, `vt=t`

and `histpos.0`

simply returns `t:1`

.