Various bugfix; midwife hadnling; stub for service permission.

Jira issue: HUBWH-6
Bugfix, sensor rate config, sensor start/stop, ...

Jira issue: HUBWH-6
Corrections:
- during continuous data acquisition graph is refreshed on callback
- before data acquisition a dummy retrieval is performed to be sure data historic data are preloaded

Jira issue: HUBWH-6
Merge pull request #16 from steverc/HUBWH-6-uiImprovement7

Hubwh 6 ui improvement7