+ close, settings buttons in plot container
+ disable close on trends tab
+ new grey-blue schema
avoid division by zero
+ implement rule : one MetricNode -> one plot , for trends plots
+ trends plots not redrawing on adding new plots
+ in MetricDto PlotSeriesDto->PlotDatasetDto
+ plot header is task name concatenated with MetricNode display name
+ add Math.abs to Format calculation
changes after review
Merge pull request #515 from dlatnikov/JFG_306_division_by_zero

avoid division by zero
Merge pull request #516 from amikryukov/improve-plots-one-scale

Formatting of yAxis label fix
rename : setChecked(..) -> setCheckState(..) in ControlTree
Merge pull request #512 from amikryukov/close-settings-buttons-only-metrics

JFG-743 Close, settings buttons in plot container
merge with master