Merge pull request #326 from CruGlobal/MH-967

Add preview picture when browsing a photo and which is not uploaded yet
Upgrade highcharts; Label number tweaks
Merge branch 'master' of github.com:CruGlobal/missionhub
Re-enable tooltips
Chart calculation fixes
Charts take into account archived people
Merge pull request #328 from CruGlobal/MH-968

Validate person email when assigning as Admin or User
Fix merging issue