Fixed NullPointerException when onTraversalStart throws.
Now logs version number information for data sources.
Now checks minimum data sources version and requires that the user
upgrade if the version is too old.

Now dbSNP uses the `All` datasource, not the `common` data source.

Refactored largeDataValidationTest to use an environment variable to
point to the test data files.

funcotatorValidation tests no longer run by default.
Need to enable these tests in jenkins.

Had to change the expected data because of new mappings from data source
fields to MAF output fields.

…nced.