deal2 - Multiple assignment

The function deal2 is designated for multiple assignment. It is an extension of the function deal. The main differences between both functions are:
- deal2 need not have equal number of input and output arguments,
- deal2 makes all output arguments empty for missing input arguments,
- deal2 transfers at most nargout arguments from input arguments,
- deal2 may split input arguments into elements and tranfer them to output arguments.
- deal2 may decompose matrices into columns and store them in output arguments

All superfluous output arguments are made empty, and all superfluous input arguments are not transfered.