Merge pull request #42 from olofsvensson/master

Improvement of workflow launch robustness and error reporting
Cleaned source and added some documentation
Merge branch 'master' of github.com:mxcube/mxcube
added Robodiff sample changer
Merge branch 'master' of github.com:mxcube/mxcube
Processing widget with PDB upload widgets
Draft of the fully automatic mode for sample centring
Removed tab and added spaces instead
Changed level of log message
Merge branch 'master' of github.com:mxcube/mxcube
Handling dummy centring
Draft of SampleChangerMockup that conforms to the new GenericSampleChanger
interface
Added the fully automatic mode to the layout
Removed unused file