ISIS-667: increase size of PublishedEventJdo's title column

from 50 to 255.
ISIS-677: further blob/clob fixes & enhancements

1. failed to render if in compact mode (ie in a table)
   - error in the wicket component hierarchy
2. show filename when in edit mode
3. in edit mode, if hit clear, then clear the filename also
4. in compact (table) mode, if blob to download, then show as title of download link
ISIS-699: backing out change.

... since the redirect doesn't always occur (not completely sure why).
ISIS-695: minor extension to Wicket viewer helper class...

... in order to support wickedchart extension (multiple series on same summarychart)
ISIS-695: removing 3rd party extension comments from example apps

in their 'pom.xml's:
- quickstart app
- simple app