So, the reactor changes have been merged a while back and have also officially released in .15.00, as per my contractual obligation (i.e. I think I said I would do so after the release) I’ll release a new, updated version of the reactor guide PDF:
GT6ReactorGuide.pdf (67.5 KB)
This is basically a formatted (and thus much more readable) version of the ingame reactor guide book. It is licensed under the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication, as also apparent when looking at the end of the document. @Gregorius should probably also link it in place of the old one.