This is a potentially expensive operation and so we should not run
it unless such values are actually needed for output purposes (e.g.,
inter-region flow summary vectors).
This commit adds a new grid traversal that computes fluxes-presently
surface level component fluxes-for all bulk connections on the
current MPI rank. We aggregate those fluxes, if applicable, into a
container for inter-region flows, but this support could be extended
to capturing the full 3D vector flow rates for restart output if
needed.
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
