Fixed hermitianization. Moved preserve_gaussian_covariance completely to the Field.

Made tests more complete.
4 jobs for fix_hermitianizer in 6 minutes and 14 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test_min #200467

00:03:06

passed test_mpi #200468

00:04:38

passed test_mpi_fftw #200469

00:05:11

passed test_mpi_fftw_hdf5 #200470

00:06:14

64.0%