Remove auto-subscribe of current users to post notifications

[mikeyarce]

This change means the current user will no longer be auto-subscribed to post notifications when actions are taken on a post.

[jerclarke]

Okay Mikey and I discussed this on slack but I'll say it again for anyone else:

I don't think removing this feature entirely is a good approach. My users take advantage of this "auto-subscribe on post edit" feature all the time and we would never want to turn it off.

The filter already offers a way to disable it for a given site.

If anything I would support a setting in the Notifications section of EF options to disable this, as well as one to disable "author is always auto-subscribed". I welcome and enjoy both of those features, but I can see why others would want an easy way to turn them off.

That said there's a separate bug that makes this situation worse: It seems to be impossible to untag yourself from a post. When I uncheck my box after being auto-subscribed it flashes green and the box returns unchecked, but reloading the page shows me checked again. Not a good situation at all. Clearly a bug.

Need to confirm how general this problem is, but it makes sense that people are annoyed by the auto-subscribe-on-edit if there's no way to undo it!

[dchymko]

That said there's a separate bug that makes this situation worse: It seems to be impossible to untag yourself from a post. When I uncheck my box after being auto-subscribed it flashes green and the box returns unchecked, but reloading the page shows me checked again. Not a good situation at all. Clearly a bug.

This bug has been addressed in #540. As far as the bigger issue around adding the ability to customize notifications, perhaps we can create that as an enhancement issue.