Tests resources folders:
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* acceleoAqlTests: tests forked from actual acceleo-aql tests/ those are already tested for generation elsewhere, we only check that the migration is correct
* evaluation: main tests, tested for migration & evaluation
* language: migration oddities, only tested for migration
* services: all services unit testing, tested for migration & generation

Tests resources for a given tests:
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* migration-related
	* <test_name>-origin.mtl: the A3 template [synchronized from org.eclipse.acceleo.aql.migration.tests.acceleo3]
	* <test_name>.emtl: the A3 compiled template [synchronized from org.eclipse.acceleo.aql.migration.tests.acceleo3]
	* <test_name>-expected-format.mtl: the A4 formatted expected template 
	* <test_name>-expected.mtl: the A4 unformatted expected template (only when generation is tested)
* generation-related (only when generation is tested)
	* <test_name>.mtl: the A4 migrated template, produced by the migration test, unformatted to keep whitespaces as in A3, used by the generation tests
	* <test_name>.xmi: the model used to launch the generation [synchronized from org.eclipse.acceleo.aql.migration.tests.acceleo3]
	* generated [synchronized from org.eclipse.acceleo.aql.migration.tests.acceleo3]
	* <test_name>-expected-runtimeMessages.txt the A4 generation expected messages
	* <test_name>-expected-validation.txt: the A4 generation expected validation