Allow separate run of full qualified testnames and simplifiy code.

You can specify an optional list of tests to run from the command line:
python test/testsuite.py jpypetest.attr.AttributeTestCase.testCallStaticString jpypetest.numeric
Simplify test modules and make all tests runnable via python -m unittest.

No need to implement a suite() method. Tests can be run via
jpype/test$ python -m unittest jpypetest.numeric
jpype/test$ python -m unittest jpypetest.attr.AttributeTestCase.testCallStaticString jpypetest.numeric
jpype/test/jpypetest$ python -m unittest numeric