Fix issue #277
The MR fixes issue #277 (closed) by exchanging WALBERLA_CHECK_EQUAL to compare two FP-values with WALBERLA_CHECK_LESS_EQUAL on their difference with a tolerance of zero.
The MR fixes issue #277 (closed) by exchanging WALBERLA_CHECK_EQUAL to compare two FP-values with WALBERLA_CHECK_LESS_EQUAL on their difference with a tolerance of zero.