Where:
- imol is an integer number
- chain_id is a string
is this a solvent chain? [Raw function]
This is a raw interface function, you should generally not use this, but instead use (is-solvent-chain? imol chain-id)
Returns: -1 on error, 0 for no, 1 for is "a solvent chain". We wouldn't want to be doing rotamer searches and the like on such a chain.