Fix default WCPS query syntax.

Extra } left over when simplifying image query in bgsmase pull
request #3 was ignored by rasdaman v9.0.3 but v9.0.4 is stricter.
Also left .red range subset specifier by mistake.
v9.0.4 compatibility fix in default query

Changing char -> unsigned char in alpha band DTM query
Not backwards compatible but can't be helped.
v9.0.4 fix to WCPS query char -> unsigned char

Make example query v9.0.4 compatible (not backwards compatible).
Use new option to specify number of non nodata values

Otherwise draws polygons to include nodata values.
Merge pull request #4 from bgsmase/bugfix_wcps_syntax

Assorted fixes to WCPS syntax and rasdaman v9.0.4 compatibility changes