Implemented alternative forward sparsity propagation through Integrator, #934
Fixed bug in a1ac87ff2cb1fef634e0d4104a51dcc8747d8af1, #934
Activated new forward sparsity propagation through forward DAE, #934
Implemented new forward sparsity propagation through backward DAE, #934
Activated new forward sparsity propagation through backward DAE, #934