Various changes: BioSystem, LIMEX_A, ODESolver,...

   Introduced a sysTol variable for setting maxCond individually.

   Got Hermite interpolation scheme up and runnnig.  Switching
   between Hermite and plain old LIMEX interpolation is possible now.

   Work towards enabling multiple integrators: got rid of BioSystemWrapper,
   replaced by the much more generic FirstOrderODESstem interface class.
   Introduced therefore two new classes BioSystem[ODE|VAR] derived from
   that interface as glue between ODESolver and BioSystem.

   The good news: there seems _no_ performance penalty for all these changes,
                  at least at first sight... keep fingers cross!
Added/re-enabled new integrator class DOP853

  Different ODESolver classes are now possible within class BioSystem
  (limex and dpo853 are avaible, for the time being...).

  The (old) class BioSystemWrapper has been discarded.
Merge pull request #3 from mojocorp/master

CMake support
Merge pull request #1 from CSB-at-ZIB/master

test