Tags of non-commits

There seems to be an inconsistency between the fetch and tag over whether 
lightweight tags of non-commits are allowed. Fetch doesn't like them, but 
tag creates them without any particular fuss. I think that fetch is right 
that, if you want to tag a blob, you should use a real tag object so that 
there's something that indicates (correctly) the type of the tagged 
object. Should git-tag perhaps automatically make a tag object if the 
tagged object isn't a commit, acting as if -a was given, except that an 
empty message is used instead of invoking an editor if -m is not given? (I 
can, of course, just use git-tag that way, but it seems generally 
unfriendly to by able to get "error:" out of a sequence of purely git 
commands, even if they're sort of odd and probably not what you really 
wanted to do.

	-Daniel
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