SinglestatPanel: Fixed absolute drilldown link issue, Fixes #1150
Tech: updated angular libs
Firefox: Workaround for Firefox bug, casued input text fields to not be selectable and not have placeable cursor, Fixes #1123
Templating: added validation to template editor for variable names, Fixes #1133
Templating: added validation for allowed characters in variable names, Closes #1106
Graph: Fix for tooltip series order when series draw order was changed with zindex property, Fixes #1108
Annotations: added html sanitation to prevent markup injection/XSS, Closes #1121
Row: css fix for collapsed rows with empty title
Updated version to 1.9.0
SinglestatPanel: decimal precision fix for uneven numbers, #1066
Updated latest.json
formating fix for the changelog
Fixed typo in graphite editor tooltip
Add offsetToZero to gfunc.
fix #1204: add separate datasource parameter withCredentials
allow multiple params for sumSeriesWithWildcards
Extend tooltip for drilldown link

It took me a bit to find out that variables need to be passed with var-variableName. 
The behavior is not specific to the drilldown link but I couldn't find it in any documentation elsewhere and it might help others to have it documented right here.
Added graphite function 'useSeriesAbove'
Add missing default parameters to useSeriesAbove
Merge pull request #1214 from DazWorrall/useseriesabove

Added graphite function 'useSeriesAbove'