Modifies loading tests.

Removes loading of data from init and .load tests.
Removes duplication of .load testing.
Adds AbstractCoverage.load test.
Removes skipped tests for loading a ViewCoverage.
Modifies _insert_set_get() for class TestPtypesCovInt

Adds time parameter to test, ignores the rest, since _insert_set_get behavior not in-line with the get_cov constructor for TestPtypesCovInt.
Merge pull request #65 from oceanzus/cm_tests_update

Cm tests update