I see the need for this, however, I have some concerns about the way it is done...
The main problem is the way our base.xacro's are provided in our description packages, i.e. that the scanners are (hardcoded) parts of the bases without a chance of providing calibration/mounting parameters to them.

In particular, this line somewhat introduces a dependency from cob_common to cob_robots....which is undesirable!

As we had in mind to restructure the base.xacro's anyway in the near future (e.g. provide separate xacros for the IPA Fahrdrehmodul instead of having the ancient PR2-wheel-based xacro), the calibration aspect for the laser scanner should be considered then, too.

In addition, as a minor comment, I would prefer to have full 6D calibration properties, i.e. x,y,z,roll,pitch,yaw rather than only x,y,yaw - even if z,roll and pitch are 0.0 for now...

I created an issue to record this: https://github.com/ipa320/cob_common/issues/157

do not merge - superseded by #305

@ipa-frm

integrated into #306