Turtle's pfSellData moves out of modules\turtle-wow.lua into
env\selldata_turtle.lua, matching env\selldata.lua for the stock list, and
each is pulled in by the manifest for its client: init\stock.xml from
pfUI_ClassicAPI.toc, init\turtle.xml from pfUI_Turtle.toc. Either way it
loads after init\env.xml and replaces the empty pfSellData declared there.
Turtle's prices used to be assigned inside the turtle-wow module body, which
put them on pfUI.env and skipped them entirely when that module was
disabled. At file scope they land on _G and apply either way.
