+ most of Manage.get_attributes()
Added acronym.vector import
+ Manage.x_min/x_max/y_min/y_max/bbox for the datasource as a whole
All tests passing - will add SRS related tests when the vector.py code is worked out
Fixed bugs discovered by unit tests.  Commented out all SRS related properties.  Need to figure out the workflow.
No longer needed
Temporary description
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Updated docstrings
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