Add tag for incremental tests.

ragconnect.tests/build.gradle

...g/jastadd/ragconnect/tests/IncrementalDependencyTest.java

...src/test/java/org/jastadd/ragconnect/tests/TestUtils.java

...dd/ragconnect/tests/TreeAllowedTokensIncrementalTest.java

...jastadd/ragconnect/tests/TreeAllowedTokensManualTest.java

...ava/org/jastadd/ragconnect/tests/TreeIncrementalTest.java

...est/java/org/jastadd/ragconnect/tests/TreeManualTest.java