Added int8 as possible dtype. Fixed tests with respect to this issue:...

Added int8 as possible dtype. Fixed tests with respect to this issue: https://github.com/numpy/numpy/issues/9290
4 jobs for master in 3 minutes and 18 seconds
Status Job ID Name Coverage
  Test
passed #202630
test_minimal

00:00:38

failed #202631
test_mpi

00:02:28

passed #202632
test_mpi_fftw

00:02:14

passed #202633
test_mpi_fftw_hdf5

00:03:17

 
Name Stage Failure
failed
test_mpi Test There is an unknown failure, please try again
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