* graphite-ds: add graphite version to config editor

* graphite-ds: modify add-graphite-function to show only version-related functions

* graphite-ds: refactor, move func filtering to gfunc.js

* graphite-ds: add new functions for graphite 1.0.x

* graphite-ds: fix unit tests (add jsonData)

fixes #8989

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Fixes #8187

Fixes #8872. Use the automatic calculation by Flot to get the
number of decimal places for ticks on the y-axis rather than
the number of decimal places for the min value.