chrome: an attempt to fix scroll issue with chrome, but this did not fix the problem as it seems to be caused by some interaction between graph rendering and scrolling, #8494

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

* properly handle X-Forwarded-For

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

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.

- Move export csv options to modal dialog

Adds series override options for dash spaces and dash length.

Resolves issue #8467