fix(graphite): Fix for bug when using series ref (#A-Z) and referenced series is hidden in query editor. fixes #2484

Including more special options for fill

Included "previous" and "none" as possible values for fill.
From the influxdb documentation:
 - "previous" means the values of the previous window is used.
 - "none" means that all null values are removed.

Change log file permissions from 0660 to 0644

Depending of the value a different set of operators will show up.
If regex only =~ and !~ will show up.
Any other value will show =, <>, <, >.

This should fix the case from when we migrate from a version that doesn't contain tag.operator.

This patch includes some missing comparators/operators for influxdb:
>  - greater than
<  - less than
<> - not equal
!~ - doesn't match against

It includes the tag.operator fields to facilitate identification of the operators on the segments.
It keeps the logic for the regex syntax; although it changes the way to validate it, to handle the new operators use case.

Including non_negative_derivative function on influxdb

Since version 0.9.0 of influxdb the non_negative_derivative function
is merged, this small patch includes it as an option on grafana.

Allow default org role to be Read Only Editor

fix(influxdb): fix for using template variables in side alias field in influxdb 0.9 editor, fixes #2446

fix(templating): fix for text panel when using template variables in text and repeating panel, fixes #2442

fix(templating): fixed issue with repeat row, was pretty buggy due to very recent change, fixes #2443

Changed font weight to look less muddy

Changed the font weight to look a bit less muddy. Any reason why we cant use a number instead of bold?

fix(influxdb): very minor fix to editor, blur event for alias input caused two refresh events, fixes #2429

updated some hard-coded colors to variables