This commit brings the system probe for module
opm-flowdiagnostics
up-to-date with recent changes in the public interface of the
module's main entry point. Commit OPM/opm-flowdiagnostics@8456e81
removed the nested type
Opm::FlowDiagnostics::Toolbox::PoreVolume
so we must drop all references to this type.
This commit recognizes the opm-flowdiagnostics-applications module
in OPM's centralised build system. We make requisite changes to the
FIND support for module opm-flowdiagnostics (header 'tarjan.h' is
currently not public) and make a first cut at explicit prerequisites
for FD-Applications.