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
- remove hardcoded dependency with registered_users group. Target is to improve suitability in convoluted multi groups/multi subsites context - in place of previous permission-based machinery, use plain table columns to detect whether user can or cannot post replies/new threads - remove permission check at the message level in favor of that on forum level