moving some indentation tests

[Tom Tromey]

Currently indentation tests seem to be in test/manual/indent.  However,
most of these could be run automatically.  So, I'd like to move them so
that they'll be run by the ordinary "make check".

I'm thinking I would move the files to test/data and then write a new
test that simply iterates over these files and checking that
re-indentation works.

Not all the files can be moved this way -- a few currently fail.  I
wouldn't move those.

Let me know what you think.

Tom