Tentacle-sock/sleeve consistency-checking

Lain-'s point in #5502 regarding the recipes being inconsistent is correct.

(Dammit.  Good catch, Lain-.)

This fixes the inconsistency: the modification now takes one charge of thread & one rag per stocking-pair, regardless of how you go about it. Also ensures that all recipes realize that "stockings" represents two stockings, so you need four (plus four rags) to make 8 tentacle-socks.

Times readjusted too.  Making individual stocking-pairs and then combining them will still be--marginally--faster, though I'll chalk that up to better organization (not sorting through a pile of fabric, your completeds not getting in the way of your current one, etc) and not enforce strict parity.