Regenerate commented messages

[ahoarau]

Better than removing the messages.

[meyerj]

The problem is that they won't work at the moment without making some of the private data accessible for ROS serialization and deserialization.

I have a working version that re-adds support for all types in another, internal set of repos, but this also requires some non-ABI-compatible patches to KDL. At the very minimal we would have to add some friend declarations, like it is done with boost::serialization::access.

[ahoarau]

Then I'm in favor of putting the commented messages in another folder, some of the message generators out there are listing the '*.msg' in the 'msg/' dirs, even the commented ones.

[meyerj]

Then I'm in favor of putting the commented messages in another folder, some of the message generators out there are listing the '*.msg' in the 'msg/' dirs, even the commented ones.

Indeed, that could be done. Or just delete the msg files and the commented code completely.
Would you mind updating the PR accordingly?