Final additions

[aranas]

• [x] get rid of researcher option in 'sector'
• [x] repetition of 'better' in gemini principles section
• [x] add principles to results section
• [x] "add value creation " to name
• [x] make main benefits optional
• [x] option to express interest in joining the September share-out
• [x] add jitter in scatterplot
• [x] make sure date & time for survey start is recorded!
• [x] add warning to results section if few responsees