Adding "-none-" as an option for donation form layouts (form_layouts.module). This will allow `webform-form-NID.tpl.php` templates to be used on donation forms, as needed. 

The request originates from IRC ticket #643.

Note that this only provides the "-none-" option. It does *not* change the default from `one_column`!
Merge pull request #235 from JacksonRiver/6.x-irc-643-form_layouts-none

Adding "-none-" as an option for donation form layouts