Report post notice 1.8

Report post notice v1.8 changes:

Rejected reports now also remove the report post notice.

Report post notice v1.7 changes:

Added link which allows moderators to remove the report notice.

Report post notice v1.6 changes:

Fixed issue with Conversation report link causing server error log. Improved error message.

Report post notice v1.5 changes:

Fixed issue with deleted post and null condition.

Report post notice v1.4 changes:

Now prevents multiple post reports.

Report post notice v1.3 changes:

Now using schema manager for database queries.

Report post notice v1.2 changes:

Fixed issue if report is being created for conversation or other non thread posts areas.

Report post notice v1.1 changes:

Added Is staff to options page. Fixed issue with extending class.