[ADD] Website KeyCDN integration guide
[IMP] stock_account: stock journal in multicompany

Restrict the property_stock_journal to the main company only. This avoids errors in multicompany when the stock journal of the main company (getting an error company mismatch) is used instead of a more useful message explaining the missing stock journal.
Fixes #3251
[IMP]Contract:Added warning message on confirmation of sales order if analytic account on analytic plan and contract is in state 'close/cancelled/pending'.
[IMP]Account:analytic_account_demo.xml: change account type.
[IMP]Chrome.js:Added action in py to filter the data according to the used contracts and same added feature to use 'action' as well as 'action_id'.
[IMP]hr_timesheet_invoice: Added warning message on onchange account_id,if account is in 'close/cancelled/pending' state.

[FIX]hr_timesheet_invoice: fix yml test.

[IMP]optimize the code.
[IMP]hr_timesheet_invoice,hr_timesheet_sheet: imporved warning message on onchange account_id, if account is in 'close/cancelled/pending' state.