- setName() for setting names of all elements of a quantity array
- transpose() for transposing quantities: now call by value and change of name
- flipGrid() changes name now

- added cumInt() that behaves as Discrete method but only calls int() of Symbolic
- fixed plus for quantities with different variables
- deleted minus since minus in parent class Discrete calls plus() of Symbolic, hence an additional implementation of minus in Symbolic was not necessary.

quantity.Discrete & quantity.Symbolic: plus and minus now support quantity and numeric arrays of same size.

- solveAlgebraic: adjusted to change of changeGrid from call-by-reference to call-by-value
- diff(): now supports specification of various variables for which the derivative should be applied. Ensured consistency with Symbolic. Maybe a more elegant use of gradient() is possible.
- unittests: adjusted for now behavior of diff()

quantity.Symbolic bugfixes:
- diff(): now supports specification of various variables for which the derivative should be applied. Ensured consistency with Discrete.
- unittests: adjusted for now behavior of diff()

Changed implementation of integration for "Discretes". The input arguments are now consitent with the matlab "int" function.

*) Allow to set empty quantity.Discrete objects with certain size
*) added the isConstant property for the quantity.Discrete
*) Implemented a cast to the quantity.Operator object
*) Implemented a cast of empty quantity.Discretes to quantity.Symbolics
*) Fixed bug in "on()" for constant quantities
*) Fixed some functions to work with empty quantities
*) Added a settings object to use global settings
*) plot function returns now an array of the figure handles
*) Re-implementation of the quantity.Operator object

Discrete.plus(): somehow I found a combination, for which plus didn't work... fixed it and created unittests

Added the ability to concatenate quantity.Discrete objects with numerical values. In this case, for the numerical value a quantity.Discrete object is initialized.

in my eyes the concatenation of arrays should not change properties of the objects and should also not create new instances. This has to be done before the concatenation or in a special version.

- bugfix in get.grid()
- horzcat, vertcat, cat now ensure, that grid and gridName of all quantities to be concatenated are compatible, by changing the grid to the finest grid.

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