The tt(run) member performs all analyses. At the construction tt(d_next) may
be set to tt(true) indicating that an analysis must be performed:

    verbinsert(-s4 //code src/run.cc)

If a simulation must be performed then the non-default specifications are
provided by the member to which tt(d_nextSpec) points.

The actual simulation is then performed by an tt(Analysis) object,
which also has a tt(run) public member performing the actual analysis.
