improve the new PreservePanelOptionsHandler

Add more info to victorOps alert notifications

docs: Change type of 'tags' in annotationQuery result example to list

Added cloudwatch metric math docs

A datasource plugin must return a list of tags in the 'tags' field of
the annotationQuery result. A string 'test' would otherwise result in
4 tags in Grafana: 't','e','s','t'.

explore/logs: Hide empty duplicates column

Fix for firefox checkboxes not appearing properly

used regex instead of string replacing

VisRepeater should not care about the value type

Signed-off-by: Steven Sheehy <ssheehy@firescope.com>

Fixed issue with AlertList panel links resulting in panel not found errors

Create default ColorPickerTrigger component

Explore: Make sure line graphs get different colors

Improved error handling when rendering dashboard panels

Optionally set histogram x-axis min/max