added more tests
added support for CD4 jar layout
Avoid problems caused by fix to GRADLE-2702
- explicitly set lingual-platform to be the test classes for lingual-local and lingual-hadoop since modules with no tests are considered to not need tests.
- platformTest does not rely on test to determine skipability and uses non-"ext" variable. These make it clear it needs a run when the full test suite is run.
Added in docs on supported SQL types and functions