added 'entity_name' keyword argument to mapper. a mapper is now associated with a class via

the class object as well as the optional entity_name parameter, which is a string defaulting to None.
any number of primary mappers can be created for a class, qualified by the entity name.  instances of those classes
will issue all of their load and save operations through their entity_name-qualified mapper, and maintain separate identity from an otherwise equilvalent object.

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