[1.0.X] Fixed #9942 -- Added a to_python handler for FloatField to ensure...

[1.0.X] Fixed #9942 -- Added a to_python handler for FloatField to ensure correct typing of deserialized data before saving. Underlying problem is analogous to #8298, fixed in [8515]. Thanks to David Larlet <larlet@gmail.com> for the report and fix.

Backport of r9695 and r9696 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9697 bcc190cf-cafb-0310-a4f2-bffc1f526a37