Hi, fitmap can currently sequentially fit different models, but it would be really handy if fitmap could also sequentially fit parts of an individual model (in a single fitmap command).

It would be great for a quick fit of a large complex if there was an `eachChain` and maybe `eachSegment` command, to sequentially fit each chain or each contiguous stretch of polypeptide.

`eachSelection` would also be useful, allowing the user to give a list of atom selections for sequential fitting in fitmap.

Cheers

Oli