sh scripts are executable now
Added migration script to the menu
Renaming the migration script because of the bug in FindUsagesManager
Merge remote-tracking branch 'origin/master' into 3.1/5456cd8_migration_adding
Merge remote-tracking branch 'origin/master' into 3.1/5456cd8_migration_adding

Conflicts:
	languages/baseLanguage/collections/solutions/internalCollections.test/jetbrains/jetbrains/mps/internalCollections/test/typechecking@tests.mps
	languages/languageDesign/pattern/solutions/test/jetbrains/mps/lang/pattern/test.mps
	plugins/execution-languages/languages/tests/jetbrains/mps/execution/impl/configurations/tests/commands@tests.mps
	plugins/mps-testing/languages/languageDesign/test/languageModels/constraints.mps
	plugins/mps-testing/languages/languageDesign/test/languageModels/dataFlow.mps
	plugins/mps-testing/languages/languageDesign/test/languageModels/intentions.mps
	plugins/mps-testing/languages/languageDesign/test/languageModels/scripts.mps
	plugins/mps-testing/languages/languageDesign/test/solutions/pluginSolution/models/jetbrains/mps/lang/test/pluginSolution/plugin.mps
	plugins/mps-testing/languages/languageDesign/test/solutions/sandbox/models/jetbrains/mps/lang/test/sandbox.mps
	plugins/mpsjava/jetbrains.mps.ide.java.tests/models/jetbrains/mps/ide/java/tests/madeUpCases@tests.mps
	plugins/mpsjava/jetbrains.mps.ide.java.tests/models/jetbrains/mps/ide/java/tests/realCode@tests.mps
	testbench/modules/testActions/models/jetbrains/mps/testActions/test@tests.mps