fixes #8446. Data with all values equal to zero, creates a max with the
value of Infinite. The for loop for creating ticks then gets stuck in an
infinite loop. This fix resets min and max and creates some fake ticks
for the y-axis if the min and max are not finite numbers.

Resolves issue #8467

add Referer header to logs. This is useful to link datasource requests to dashboard that originated it (#8399)

* support setting the handler attribute in sensu alert notifications

* allow the user to set the source attribute of Sensu notifications

* remove X-Forwarded-* headers added by nginx when proxying data source & plugin requests

* properly handle X-Forwarded-For

fix: s3 image uploads to us-east-1 (us standard) did not return correct image urls so images shared to slack and other services was not correct, fixes #8444

Simple query editor - a text area with a Show Help section.
Validation for empty query and if the time_sec column is missing.