Add ability to control post revisions and autosaves on a per-post basis

[aaroncampbell]

On very large posts (ok, ridiculously large) the diff comparison causes the post page to exceed the normal time limit for PHP scripts (usually around 30 seconds). The post in question is about 1150 lines and about 110,000 characters. Every time I want to edit it, I first have to go into the database and remove the revisions and autosave. However, it's REALLY nice to have that for the thousands of other posts on the site.

this is plugin material