BS-2965 : [6.2] overview form: 2 scrollbars
BS-373 : [bug]: Unexpected scroll bar in portal

-In the BonitaForm.html, rename the "Wrap" element into "footerpusher"
-Resize form iFrame using the size of the "footerpusher" element.
Merge branch '6.2.x' of https://github.com/bonitasoft/bonita-web into 6.2.x