building a whole simulator for this, and then not even
running a test for it, seems rather excessive. if a test for
index-conformance is wanted, a better approach should be taken.
This commit distinguishes the reference condition pore volume from
the dynamic, pressure (and/or temperature) dependent pore volume
value. Previously we would report the latter as the 'PORV' value in
the "Field Totals" and "FIPNUM region" reports, but this commit
switches to reporting the former instead-mostly for compatibility.
We still report the dynamic pore volume value, but now we report
this on a line of its own, before the table, using one of the forms
Field total pressure dependent pore volume = 12345 RM3
FIPNUM report region 1 pressure dependent pore volume = 123 RM3
