[IMP]hr,hr_holidays,hr_recruitment:improve usability point of hr_onboard...

...ing task add new toggle button widget for form view.

Task: https://www.odoo.com/web#id=10564&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/r.zUPaUqErM8fV8bBJ

Hello @msh-odoo 
Here oe_left have a fix width=305px. with the use of this class our form view is not appear proper. 
We require 400px to fit both Employee name and "Create employee" button in one line.
![screenshot-33211-master-b51646 runbot odoo com 2014-12-10 12-17-00](https://cloud.githubusercontent.com/assets/7599718/5371946/1f206768-8067-11e4-8ab6-17f4f42ce759.png)