Feature request: tag once per page

[ericsallinger]

like Wikipedia does, it would be nice to have a mode where autotag only adds 1 of each tag per page if a page is included multiple times. This would allow for connecting pages easily without cluttering the linked references section.

For example the output of a page containing the following text:
"Submersible is often used to differentiate from other underwater vessels known as submarines, in that submarines are fully self-sufficient craft"

would be:
"Submersible is often used to differentiate from other underwater vessels known as [[submarines]], in that submarines are fully self-sufficient craft"

rather than:
"Submersible is often used to differentiate from other underwater vessels known as [[submarines]], in that [[submarines]] are fully self-sufficient craft"