Merge pull request #3 from pedrobaeza/purchase_discount-fix

[FIX] purchase_discount: Problems installing module
7.0 metafiles
OCB branch also in tests.
Merge pull request #7 from pedrobaeza/7.0-metafiles

7.0 metafiles
autopep8 lint
manual lint
Merge pull request #19 from lepistone/7.0-lint

7.0 lint
Merge remote-tracking branch 'origin/7.0' into 8.0

Conflicts:
	.travis.yml
	README.md
[ADD] purchase and purchase requisition generic improvements
(../generic-addons/ rev 10.1.1)
[REVIEW] reviewed feature branch: pep8, styling, rewrite of intricate methods, licenses, ...
(../generic-addons/ rev 10.1.3)
[FIX] wrong company name, missing license, missing coding, wrong indentation for brackets (pep-8)
(../generic-addons/ rev 10.2.1)
[IMP] do not override completely the warehouse_id field, instead prefer to replace the only attribute to modify
(../generic-addons/ rev 10.2.2)
[FIX] pep8: space after commas, spaces around operators, cut long lines; use orm.Model rather than osv.Model
(../generic-addons/ rev 10.2.3)
[FIX] empty list evaluates as False
(../generic-addons/ rev 10.2.4)
[FIX] intricated condition
(../generic-addons/ rev 10.2.5)
[FIX] return early when the condition is evaluated to False to simplify the reading flow
(../generic-addons/ rev 10.2.6)
[FIX] unclosed literal
(../generic-addons/ rev 10.2.18)
[IMP] moved purchase modifications to the right module
      [IMP] improved bid workflow
(../generic-addons/ rev 15.5.1)
[FIX]purchase_extended: use rfq/po type in menu actions to differentiate cancelled rfq/po
(../generic-addons/ rev 15.5.3)
[IMP]purchase_extended, purchase_requisition: documentation
(../generic-addons/ rev 15.5.9)