Hi,

I came across many forwardxxxxxxx files left in the TMP directory.
Where xxxxxxx is a unique alphanumeric characters and TMP is a
directory that the user option `gnus-uu-tmp-dir' specifies, and
those files are all empty.  They should have been deleted, shouldn't
they?

I looked into the code and realized that such a file was created
when I forwarded two or more articles in a single message.  Whereas
other gnus-uu files are created in the `gnus-uu-work-dir' directory,
and are deleted when exiting a group.

In relation to this, `gnus-uu-decode-binhex' and
`gnus-uu-decode-binhex-view' seem to try to run without initializing
`gnus-uu-work-dir'.  I have no binhex data, so I haven't fully
tested them, though.

May I commit this patch?

2013-12-18  Katsumi Yamaoka  <yamaoka@jpl.org>

	* gnus-uu.el (gnus-uu-decode-binhex, gnus-uu-decode-binhex-view):
	Make sure work directory exists.
	(gnus-uu-digest-mail-forward): Store temporary files in work directory
	rather than tmp directory.