add XYZ axis labels + camera names to 3D plot

[mandulaj]

The Axis in the plot are confusing. Adding labels also to differentiate the cameras makes it much easier to orient.

[ethzasl-jenkins]

Can one of the admins verify this patch?

[goldbattle]

Could you add a screen shot of what it looks like now? Thanks!

[mandulaj]

Of course, here is the plot with XYZ axis labeled and a accompanying camera label for each of the poses:

[mandulaj]

BTW: It seems the Build errors in Ubuntu 16 and 18 are related to some unauthenticated packages:

E: There were unauthenticated packages and -y was used without --allow-unauthenticated

[goldbattle]

These look nice. Could you push a fix for the two dockers too? Many thanks!

[mandulaj]

@goldbattle I made a pull request with the Docker packages fix in #655. It built on my system so lets see if it passes the build test on Github.

I would consider pushing the images to a registry (either Dockerhub or Github) so that they don't have to be rebuild every time. Let me know if you would like some help setting this up.