#1024 Added Variable::setName
#1024 Changed Variable::v, Variable::d types to SXElement (scalar, internal class)
#1024 Changed Variable::timed_ type to SXElement
#1024 Added Variable::beq for binding equations, Variable::ode for derivative binding equations
#1024 Renamed SymbolicOCP::ode pending removal
#1024 Added getters and setters for binding equations in SymbolicOCP
#1024 Removed old SymbolicOCP::ode
#1024 Removed SymbolicOCP::quad
#1024 Removed Variable::value