Issue #2618566 by xjm: "In core since" and the list of modules added to core does not work when providing data for both D7 and D8

Issue #2172239 by xjm, webchick, chx, sun, Gábor Hojtsy: Flesh out list of modules that were moved to core in 8.x

Issue #2615540 by xjm: Use in_core_complete rather than in_core_note to set the warning icon for modules moved into core

Add notification that the form submit worked so you don't drive yourself completely insane re-submitting the form 50 times thinking you're doing something wrong. Ahem. Patching for a friend. ;)

their fetch()-ing cousins.

That means compare.inc, fetch.inc, and report.inc. Fatal errors abound! :)