Adding more JavaDoc to Cell explaining how a singleton instance of Cell will behave if used in multiple Columns or Cell Widgets. The text comes from a rather brilliant email I recently authored.  Also removing some stale JavaDoc about Cell view data from the Column class.  Columns were originally responsible for ViewData, but that was changed before the first release of Cell Widgets.

Review at http://gwt-code-reviews.appspot.com/1515804

Review by: rjrjr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10507 8db76d5a-ed1c-0410-87a9-c151d255dfc7
2 files changed