This changes the URDF and timeout for the TurtleBot configuration,
and adds a Dockerfile with everything that is needed to run 2D SLAM
with a depth camera. Verified to work on a TurtleBot 2 with an
ASUS Xtion.
And tiny style fixes.
Instead of drawing into a offscreen texture and blitting the
result as an overlay (which shows up on top of everything else)
we directly draw to the RViz scene. To get proper X-rays one
should use a 0.5 gray background for now.
Also fixes the configuration to enable 3D mapping from a bag.
* Add code to allow offline processing of 2D Cartographer bags.
Fixes waiting for transforms to be published, adds support for multi-echo
laser scans, sets default values for the submap topic and query for the
RViz plugin.