[FIX] web_tip: don't display tip on element whose width or height is 0

This commit allows a tip to be properly displayed on elements containing
an img tag. Previously the tip would be displayed before the image could
be loaded, thus breaking the ui.
[IMP] Project : Add Graph near Task and Issue,rename tab of form,focus + sign when empty kanban view,invisible remaining time when no managing time,don't show project name in bow if coming from a project,review default stage and change default group by