Improve speed with vectorial unique value legends
fixes #328Zoom wheel
fixes #327Spatial index is not thread safe
refs #314Join with tables from ODBC
fixes #325Labeling withoud drawing shapes. (Only show text)
Avoid problems when clonning layers with problems (for example, broken wms layers)
Small null test for drivers with null legends.
fixes #324Possibility to use a different strategy (useful for LiDAR, for example)
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