helios changes:
- adds "Widget" to widget class names
- adds HLWidget >> openAsWidget
HLListWidget navigation: prevent scrolling of parent div
helios: flush any progress bar on error
helios: progress bar flush fix
adds Error >> #resignal
helios: a bit more flat look
Add class comments for some Helios-Announcements
Add SystemAnnouncement class>>heliosClass
Add announcement image and class
Merge remote-tracking branch 'remotes/johnyt/announcements'