- checks numel
- better readable

- now also checks sizes
-

Removed exportData as property and added a converter for this class
Fixed integration for empty objects.
Fixed name of integrated quantities.

added functions misc.fold and misc.unfold to convert vectors/arrays from and to folding representation

misc.solveGenericBvpFirstOrder: new function to solve BVP as in regulator equations for hyperbolic systems. supports ode at boundary, multiple eigenvalues and spatially varying coefficients