Signature:

      SUBROUTINE h5sis_regular_hyperslab_f(space_id, IsRegular, hdferr)
        INTEGER(HID_T), INTENT(IN) ::  space_id
        LOGICAL :: IsRegular
        INTEGER, INTENT(OUT) :: hdferr

Inputs:

      space_id  - The identifier of the dataspace.

Outputs:

      IsRegular - TRUE or FALSE for hyperslab selection if successful.
      hdferr    - Returns 0 if successful and -1 if fails.