Tests for ipopt

Signed-off-by: Matthias Kümmerer <matthias@matthias-k.org>
Count function calls, return values

Signed-off-by: Matthias Kümmerer <matthias@matthias-k.org>
Enable ipopt from interface

Signed-off-by: Matthias Kümmerer <matthias@matthias-k.org>
Remove debug statement

Signed-off-by: Matthias Kümmerer <matthias@matthias-k.org>
renamed to optpy

Signed-off-by: Matthias Kümmerer <matthias@matthias-k.org>