Implement post anonymously through explicit forum attribute in table
Now moderators can explicitly decide whether a forum will enable posting anonymously or not.
Forum must be in a policy different from closed and the anonymous flag must be set accordingly for this to happen.
Also:
- normalize api in a way it can accomodate all current attributes. In particular,
now edit api will now leave every unspecified attribute unchanged, instead of
setting it to some default.
- fix some usability issues when managing forum parameters (e.g. values not
retrieved in form when editing existing forum)
- introduce missing Oracle upgrade script for the whole forum reform
- fix oracle creation script