The qty_available available of a product can be negative (e.g. using the force availibility button on delivery order) and the generated account.move.line should be adapted (otherwise getting negative values in debit/credit entries).
Fixes #2475

[IMP] Changing the standard cost price should do the real-time valuation for all variants of the template

bzr revid: qdp-launchpad@openerp.com-20140425121810-tp2caagu1rnzpgcg

[REF] stock_account, product: moved the standard price historization in 'product' module, as it doesn't depend of stock (or account) at all and it was causing problems for products created before stock_account was installed, like all demo data products (no entry for them in prices_history table)

bzr revid: qdp-launchpad@openerp.com-20131206103150-2mnvsipy9uai3xlk

bzr revid: qdp-launchpad@openerp.com-20131205131117-kuaubvz9esd025l7

bzr revid: qdp-launchpad@openerp.com-20131204105920-565t0ijcyue6ydkx

bzr revid: qdp-launchpad@openerp.com-20131029160643-xpr1ej51klvwy6xk

bzr revid: qdp-launchpad@openerp.com-20131029150959-rbv9lyzhcx6pi4vc

bzr revid: qdp-launchpad@openerp.com-20130903135711-0ci0cz7n5jld4tyg

bzr revid: fp@openerp.com-20130804115325-ejsbn2qoawnrgaic

This should be replaced by a SQL view.

bzr revid: vmt@openerp.com-20130801094553-1vuorucdyne38ln3

bzr revid: vmt@openerp.com-20130730114039-09f8l896imgps8m9

bzr revid: qdp-launchpad@openerp.com-20130715112219-o1bh3hipzxpxrtw9

bzr revid: jco@openerp.com-20130715081809-9wjk787xp3gcsi3e

bzr revid: qdp-launchpad@openerp.com-20130712141407-amspq13axc7x58l1

[WIP] split stock module in stock and stock_account that installs itself only if account+stock are installed

bzr revid: qdp-launchpad@openerp.com-20130711130528-c9jjiduqriakj9iv