Class for iterating over chains in a Structure.
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          | __init__(self,
        st) x.__init__(...) initializes x; see help(type(x)) for signature
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          | chainNames(self) Return a list of chain letters
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          | __len__(self) Return number of chains in the structure
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          | __getitem__(self,
        name) Return chain object for chain <name>
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          | __delitem__(self,
        name) Delete the chain <name> from the Structure.
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          | __iter__(self) Iterate through all chains in the structure.
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    | Inherited from object:__delattr__,__format__,__getattribute__,__hash__,__new__,__reduce__,__reduce_ex__,__repr__,__setattr__,__sizeof__,__str__,__subclasshook__ |