Version 0.4.0

• The first version that requires Julia >= 1.0 (all Julia 0.6 and 0.7 code was removed).

• ModiaMath.SimulationState has a new keyword argument structureOfDAE.
  It is now possible to define that the DAE is linear in all derivatives or all derivatives
  are explicitely solved (= ODE). If one of the new structures is selected,
  initialization and re-initialization is more robust and more efficient
  (in particular no implicit Euler step is used).

• ModiaMath.plot supports variables that can be computed from a vector of struct result
  (for details, see docu of plot).

• Using newest versions of all used packages (since issues with Sundials).

• Docu of SimulationState and of StructureOfDAE introduced.

• Version information adapted to Modia style (Version/Date constants).

• Info message of simulation start only printed if log=true.