[FIX] sale: config, timesheet if module account_analytic_analysis

In Settings > Sales, the onchange_timesheet ensure that if you check timesheet, it checks module_account_analytic_analysis.

Therefore, if module_account_analytic_analysis is installed, timesheet should be checked by default
Until now, it worked "luckily", because the onchange_timesheet of the field module_account_analytic_analysis was triggered before the onchange_timesheet of the timesheet field. Nevertheless, we shouldn't trust the onchange calls order.
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-win32