[IMP] purchase: misc usability improvements
- RFQ wording imp
- products tree view in purchase form view: set account_analytic_id
for group_analytic_accounting only + add a context for the partner
- purchase: res_config: wording imp + config view imp
[IMP] web: order fields in export wizard

(Closes #1645)
Hide the Edit bar with mobile.
[IMP] form views: remove sheets in config forms

(Closes #850)
[IMP] sale: product_id_change now supports a void pricelist and/or a void partner_id.
website_quote: validity, options and template now readonly when not in draft
and sent status (aka confirmed).
[ADD] l10n_in_account_voucher: Localization module for voucher report and email template