Consider supplying both smoothed + raw values in each COVIDcast signal

[krivard]

Most COVIDcast signals come in two flavors: smoothed and raw.

• doctor-visits: no, for datasource privacy reasons
• fb-survey: yes; CLI, ILI, WCLI, WILI, HH community CLI, no-HH community CLI
• google-survey: yes
• ght: yes
• quidel: yes; percent negative, tests per device
• jhu: in testing for 1.4

Considering cmu-delphi/www-covidcast#TBD, it might be nice to explicitly combine raw+smoothed pairs of signals instead of publishing them separately, and provide them as an extra column in the API response (even if they are still stored separately in the database).

This would also help with cmu-delphi/covidcast-indicators#67 and cmu-delphi/covidcast-indicators#36, since it would permit us to display the raw signal in time series charts without interfering with map coloring. The raw time series does not display the misleading sawtooth pattern.

[krivard]

wontfix