Get rid of grokengine references. Still some more to address.
Adds cells4 test.
Fix up cells4 test to conform to unittest format and to fix style issues.
Adds sp overlap test.
Convert sp overlap test to unittest format and fix style issues.
Convert tp10x2 tests from trunk to unit test format with style fixes.
Moves longer running tp10x2 tests from trunk into integration tests.
Adds in integration tests from trunk. These haven't been formatted yet but work as is (exit with non-zero exit code on failure).
Moves opf tests from trunk to integration tests. These are not formatted yet.
Adds aggregation integration tests from trunk.
Move delta filter test over from trunk.
Convert filters test to unittest format (mostly) and fix style issues.
Adds array_algorithsm_test.
Adds cast mode test.
Adds lgamma_test.
Adds NuPIC random module tests.
Added sparse binary matrix test.
Adds sparse matrix test.
Adds sparse tensor test.
Restore ModelRunner and DummyModelRunner that are still used in some locations. Removed more grokengine references.