(XMLReader.encode): New. Encodes the given
string appropriately for use in Thuban. Fixes RTbug #1851.
(SessionLoader.end_projection): Handle the context of the
projection tag a bit better by looking at what objects are not
None. There was an assumption that a projection tag for a map
could occur before any layers.
(SessionLoader.start_clrange): Provide backward compatibility for
reading min/max values as well as the new range parameter.
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