#42 Simplify renumbering and changing chain IDs

[Anonymous]

Hi-

It's often necessary to rename chains, and renumber amino acids in a somewhat arbitrary way (e.g. to match a modeling template, to account for gaps, etc).

I think this can currently be done using the alter command, but it would be a lot easier for non-programmers if we could select a range of residues, and then use a menu command to "set chain ID" or "renumber starting at __"

Thanks!
Jonathan