Refactor code to remove code duplicated related to get real context. Also, the language is removed if exists and the context is a Web Section or Web Site

Fix bug on budget consumption views, sum and details where using different simulation state parameters
Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

* Base_getPreferredPrecision: there are no such thing as a global preferred
  precision. We should use the precision of the resource or price currency
  depending on whether we display quantities or prices.
* Base_getRoundValue: just call round or use precision= parameter from
  inventory API

Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

The month was taken from a date in the wrong timezone
Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

http://erp5.nexedi.com/bug_module/1591

And replace is uses by AccountingTransactionLine_getNodeItemList

This is achieved by using document metadata

With current implementation, when passing notifier_list="Mail Message",
the same email is sent len("Mail Message") times.

Prevent getAvailablePropertySheetList and getAvailableConstraintList from returning internal attributes such as _lock and _factory

As zope prevents from creating objects starting with _, we can filter out
attributes whose names starts with "_"

Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

It would be a link to the domain, category or temp domain, which is useless for
end users.
Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

Signed-off-by: Aurélien Calonne <aurel@nexedi.com>

The class is named listbox-table-summary-cell
Signed-off-by: Aurélien Calonne <aurel@nexedi.com>