o.c.ui.menu.app: Define "navigator" location to avoid "Search" gap
Bugfix: do not request another refresh if the previous hasn't been completed yet.
Bugfix: check for history refresh required after each history data merge.
Merge pull request #421 from ControlSystemStudio/bug377

o.c.ui.menu.app: Define "navigator" location to avoid "Search" gap
Merge pull request #422 from jbobnar/master

Bugfix: Automatic history refresh: fixes #75
Merge remote-tracking branch 'origin/master' into sns