Adding startup/shutdown function for thread safe cache system. Added request middleware class to use those functions.
Improved automatic deduction of data file semantics according to given range type.
Added convenience lookup dicts for gdal data types. Added url property for spatial references.
Added new model 'NilValueSet', wich is a collection of nil values and is referenced by bands. Added proper admin functionalities to handle the new type.
Added new namespaces and element factories.
Added lxml.etree implementation for WCS encoders. Might be better to be modularized. Using new calls in several service handlers.
Added 'onlineresource' config parser option.
Added 'constraints' property to service handler interface.
Moved referenceable dataset renderer to own module.
formatting.
Adapted new module layout.