Fix --hint output, and check for multi-DB support in more places.
Fix --hint output, and check for multi-DB support in more places.

The --hint output was mistakenly warning that the evolutions it just
provided could not apply. This was due to a code block being accidentally
indented one too many levels. It's now fixed and the hint output is
correct.

The evolve command is now more careful to check for multi-db support in
more places.

git-svn-id: 48f3d5eb0141859d8d7d81547b6bd7b3dde885f8@191 8655a95f-0638-0410-abc2-2f1ed958ef3d

clones/django-evolution