Inconsistent handling of PORV/MULTPV in EDIT section

[blattms]

We have a test PORV in FieldPropsTests.cpp with:

EDIT

BOX
  1 10 1 10 4 4 /

MULTPV
  100*4 /

ENDBOX

BOX
  1 10 1 10 3 3 /

PORV
  100*3 /

ENDBOX

which has the expected result, because when getting PORV from the FieldProperties for writing the first time, we will calculate it from PORO, NTG, MULTPV and cell volume.

But if we put PORV before MULTPV, then the multiplier will not be accounted for and the test breaks, see #4023. Due to the non-overlapping boxes this should definitely be a problem.

What if the boxes overlap or are the same? Would order matter here?