Eliminate zipping from build
introduce core.structure.IIdentifier: INamedConcept with constraint
fix diff test
IIdentifier for core.query language
Merge remote-tracking branch 'origin/master' into 3.1/mikev/test

Conflicts:
	plugins/newLanguageDesign/languages/query/languageModels/structure.mps
	plugins/newLanguageDesign/languages/query/source_gen/jetbrains/mps/core/query/constraints/ConstraintsAspectDescriptor.java
	plugins/newLanguageDesign/languages/query/source_gen/jetbrains/mps/core/query/structure/StructureAspectDescriptor.java
make project
run GeneratorsRunner