integrate redmine header (draft)

put setting into general section
fixup some style conflicts. we need to completely namespace that board.

body background white

move jumpbox into redmine header, more taskboard background style fixes

remove breadcrumbs if redmine header is on

fix font family conflict
put backlogs main menu before issues so new issue is near issues tab
Merge pull request #790 from patrickatamaniuk/ui/redmineheaders

Visual integration of backlogs and redmine: add option to show redmine headers in backlogs pages