Added methods that take SCOP Ids rather than SCOPDomains.
1. Added support for chain Ids of more than 1 character. This deprecates
the method ResidueRange.getChain() in favor of the new
ResidueRange.getChainId(). 2. Changed interface of parseMultiple(String,
AtomPositionMap) so that if the range is the whole chain, it returns a
ResidueRange with null start and end rather than a null ResidueRange. 3.
Fixed issue where A_1-100_ was considered a valid range (underscores
were being allowed). 4. Added a new method parseMultiple(List<String>).
5. Added a new method looksLikeRange(String).
Made AtomPositionMap work with chain Ids of more than 1 character.