OpenTSDB: Downsample query field now supports interval template variable, Closes #1242
InfluxDB: Support more than 10 series name segments when using alias  patterns, Closes #1126
Graph: Fix for y axis and scaled units (GiB etc) caused rounding, for example 400 GiB instead of 378 GiB, Fixes #1251
Graph: hover tooltip and axis format units fix, bug introduced last week
Merge remote-tracking branch 'upstream/master'