Fixed the problem with default settings of the chart (#415).
Added persistence of the automatic history refresh and future buffer.
Eliminated a warning in the EditItemsCommand.
Changed the names of exported column in the SelectionValueExporter.
Bugfix: if futureBuffer was set, the timerange change was ignored.
Merge pull request #418 from jbobnar/master

Legend problem (fixes #415) and a few other minor issues
Bugfix: the axis got messed up if opening a plt file created after GraphSettings were introduced and before the recent refactorization (#419).
Merge pull request #420 from jbobnar/master

Bugfix: the axis got messed up (fixes #419)
Merge remote-tracking branch 'origin/master' into sns
o.c.ui.menu.app: Define "navigator" location to avoid "Search" gap