Updated version number to 2.3.22-nightly
Support choosing default incompatible_improvements for the TemplateTestSuite
Bug fixed [145]: Active only with incompatible_improvements set to 2.3.22 (or higher): #include and #nested doesn't change the parent Template (see Configurable.getParent()) of the Environment anymore to the Template that's included or where #nested returns to. Thus, the parent of Environment will be now always the main Template. (The main Template is the Template whose process or  createProcessingEnvironment method was called to initiate the output generation.) Note all this only matters if you have set settings directly on Template objects, and almost nobody does that. Also note that macro calls have never changed the Environment parent to the Template that contains the macro definition, so there's no change there now.