Fixed a glitch in BioProcessor::prepDetailedSens.

  When using the Variational Equation for sensitivity computing,
  the wrong dimension of the solution trajectories was checked
  (missing to count the 'virtual' time variable...)

  Additionally, a minor bug had caused some compilation warnings,
  as the 'new' BioMedication class was not included yet in the
  swig interface.  Silly me!

  Finally, bumped the PARKINcpp lib version to 2.1.9 by this commit.