[FIX] models: improve rationale for the management of flag 'recompute' in context

When the context contains 'recompute': False, the recomputation was not even
prepared. Now both create() and write() prepare the recomputation by invoking
method modified(). The flag only controls whether method recompute() is invoked.
In addintion, the former flag 'no_store_function' was converted to the flag
'recompute', so that both create() and write() use the same flag.

Fixes #1456
[FIX] web: rendering issue in mail composer on Firefox

The cleditor width does not include the margins. Setting 100% will make the editable area too large (104%) on Firefox (opw 611700).
Replaced by auto, the default value adviced by CLEditor.
[FIX] purchase: purchase buttons on product form only for purchase users
Merge pull request #1790 from thanhchatvn/patch-2

Update vi.po
Merge pull request #1800 from blaggacao/8.0-l10n_co

8.0-l10n_co
[FIX] web: ignored readonly attribute on image widget
[FIX] mail: tell orm to rename column "read" to "is_read"
[FIX] HTML Questions
[FIX] HTML Questions
[FIX] website: correct unslugify of routes
[FIX] base: show "application" in view view
[FIX] point_of_sale: the receipt would not print correctly on first try
[FIX] account_anglo_saxon: variable 'standard_price' referenced before assignment

Due to forward-port, the variable standard_price was reintroduced instead of valuation_price_unit
Move the change of currency after the fifo/lifo computation.
Fixes #1801
[FIX] HTML row
[IMP] auth_oauth: set default 'zocial' css_class

The buttons for new providers needs at least the zocial css class to be seen as button. As the field css_class is not in the default form view, add it by default.
[FIX] point_of_sale: prevent changing the customer after printing the receipt
[FIX] project_issue: project issue user must be able to read resource calendar

In order to be able to read the days_since_creation field
[FIX] point_of_sale: updated the tooltip for the to weight option to make it clearer that it is to be used with the hardware scale integration
[FIX] models: onchange return all subfields in cache when no subfields presents
[FIX] base: python 2.6 incompatibility for dictionary comprehension