Allow ManyToManyFields to be checkbox lists in Admin Interface
|Reported by:||Owned by:||Adrian Holovaty|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
ManyToManyField currently shows up as multiple-select selectboxes in the admin interface. Aside from not being very usable, it would also be nice to have the ability to display these as checkboxes instead of select boxes.