liquid two column layout for master backlog page

set editor width for sprint title

set story subject editor width

relase storypoints and story header widths
set backlog to full width if other panel is hidden - use view options to trigger this
multiline subjects, fixes #808

add multiline button to toolbar

store multiline in UserPreferences
fix for IE: burndown options, story editing
Merge pull request #818 from backlogs/patrick/liquid-layout

Patrick/liquid layout