- new S/R for resetting main-model params (switch off flags); - compute vertical velocity if not read from file (switch exactConserv   & staggerTimeStep); - change monitorFreq to print only 1 dynstat monitor at the end; this fixes   output of ptracer monitor iter & time for default PTRACERS_monitorFreq.
- new S/R for resetting main-model params (switch off flags);
- compute vertical velocity if not read from file (switch exactConserv
  & staggerTimeStep);
- change monitorFreq to print only 1 dynstat monitor at the end; this fixes
  output of ptracer monitor iter & time for default PTRACERS_monitorFreq.

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