TST: test_indexing dtype comps (GH5466)

TST don't compare invalid indices in eval operations (GH5467)

TST: invalid assignment for np.timedelta64 (GH5465)

TST: skip locale checks on windows (GH5464)

TST: dtype comp issue on windows in test_indexing (GH5466)

TST: skip test_pow on windows (GH5467)