tests/test_nanshe_learner.py: Set number of threads for SPAMS to 1.
tests/test_spams_sandbox.py: Set number of threads for SPAMS to 1.
tests/test_nanshe_learner.py: Set num_drmaa_cores to 1.
tests/test_nanshe_learner.py: Dropped unneeded print statements.
tests/test_nanshe_learner.py: Remove data copying commands in test suite.