[Indigo] Restructure and cleanup about cob_robots HOT 6 CLOSED

I started to use the new namespace structure for cob3-6 in simulation
cob_common/cob3-updates
schunk_modular_robotics/cob3-updates
cob_robots/cob3-6_updates

It's not yet finished.....this is just to let you know about it.....will be finalized and synchronized with indigo hardware for cob3's before a PullRequest to ipa320 is sent...

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still need to fix launch files for schunk_sdh, cob_trajectory_controller and head_axis namespaces in cob_bringup launch files

see ipa320/schunk_modular_robotics#131, ipa320/schunk_modular_robotics#130, ipa320/cob_driver#208, ipa320/cob_control#26

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more restructuring done in #278 #279 #282

adaptions to schunk_powercube_chain, schunk_sdh, cob_trajectory_controller and cob_head_axis done in:

• ipa320/schunk_modular_robotics#132
• ipa320/cob_driver#210
• ipa320/cob_control#27

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I guess most of the restructuring is done and merged...
It performs well on cob4 and simulation....
However, there still seems to be some mismatches on cob3's (see ipa320/cob_command_tools#93)

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@ipa-nhg @ipa-fmw
now that #303 has been merged should we adjust cob3-6 and cob3-9 for indigo accordingly, i.e. bringup launch file and configs?

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#314 probably fixes it in a satisfactory way for now....

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