fixes #8989

Icon adopted from grafana_icon.svg

Reference document:
https://developer.apple.com/library/content/documentation/AppleApplicati
ons/Reference/SafariWebContent/pinnedTabs/pinnedTabs.html

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.

in the prefix or postfix fields and when adding a gauge.
Previously the template variable substition was only done
when not rendering the gauge.

Merge branch 'aws-instance-attribute-tags' of https://github.com/paco3346/grafana into paco3346-aws-instance-attribute-tags