provide a parameter for each camera calibration file

[vrabaud]

Instead of one for all cameras. It's easy to implement and I can do it, I just want your approval.

[severin-lemaignan]

Not sure to get what you mean, here...?

[vrabaud]

right now, in the reconfigure, there is only one camera_info_url. I'd like to have: camera_info_url_top, camera_info_url_bottom and camera_info_url_3d (I don't want to reinput the file path every time I change camera).