changed misc.diag_nd to use a for loop on the domain, which will be collapsed.

Added misc.rat to compute rational approximations of real numbers

Added quantity.EquidistantDomain to simplify the initialization of a domain with a certain step size

Fixed signals/SmoothStep to use spline wise interpolation instead of symbolic computation

It uses the isequal comparison now to check if the objects have the same entries and not the == as before.
Changed type of quantity.Domain to handle

except some points, that must be discussed for the quantity.Symbolic, the implementation of quantity.Domain seems to be nearly finished.

Bugfix quantity.Function.on = quantity.Symbolic.on :  didnt work for quantities with more than 2 grids until now. Values were always concatenated along the second dimension so far. Then reshape resulted in wrong result.

Added converter of quantity.Discrete to quantity.Function: a linear interpolation is used as valueContin$

Changed precision in the computation of the state transition matrix and added the feature, that the state transition matrix is computed on the basis of function handles if the system matrix is symbolically defined

I guess fixed uminus in quantity.Function is still buggy.

Initial checkin of the matlab library for the control and faultdiagnosis of infinite dimensional systems