Changes to 0.7.4 * Primitive symbolic derivatives of some expressions * Parametric plots * Accepts identifiers as well as functions in a number of places * SYNTAX: When adding a scalar to a square matrix "A+x" now acts as "A+x*I" rather then A+x*ones. If you want to add a scalar to every element of a matrix, use .+ and .- operators. Behaviour is element by element for vectors (1 by n or n by 1 matrices) * SYNTAX: 'call' now binds tighter to allow "x = f call (x)" to act like x=(f(x)) rather then (x=f)(x) * SYNTAX: allow "identifier + string" which creates a string * Added functions: IsFunctionOrIdentifier, ComposePower, Derivative, SymbolicDerivative SymbolicDerivativeTry, SymbolicNthDerivative, SymbolicNthDerivativeTry, SymbolicTaylorApproximationFunction * Many minor fixes