Apparently the format bot uses a bleeding edge clang-format that uses
the new Google style and reformats a bunch of files in every PR. This is
an empty commit to trigger this in a separate commit.
See 62e3198c4f
Check for basic stream errors before doing more involved read actions.
The log message in this case is also more descriptive than
`Check failed: reader->ReadProto(&pose_graph)`.
This implements loading of serialized maps in 2D:
We insert all submaps at the serialized optimized pose into
the pose graph and remove their poses from the optimization.
Related to #197 and #315.