[AndyB] Advanced Search 4.1

Added Method to options page.

Now defaults to Post content when entering search criteria.

Updated template variable.

Fixed post date when showing results by post content.

Added rich username on results page.

Compatible XF 2.x versions: 2.3

Search forums now excludes "Link forum" type of forums.

Now excludes posts which are in a soft deleted thread.

• Added Results count to Advanced search results page.