[emacs-w3m:13661] w3m-download trouble

You may recall I offered a very different implementation of w3m-download
than exists in the master branch, so only now when I was testing PR#80
have I recently been using the master branch version.

What I'm finding is that I can only get the feature to work for
file-type 'txt'. Anything else reports a failure, but the debug output
to the *Messages* buffer indicates no error, reporting many download
progress lines, correct URLs and pathnames,  and HTTP 200 status.

Here's an example output:

File(/home/boruch/.w3m/verifiedfacts.html) downloading failed:
W3m-in-progress: 0.02/6.75kb

8< -----<snip>------ >8

W3m-in-progress: 7.17/7.17kb
W3m-current-url: http://www.verifiedfacts.org/
W3m-document-charset: US-ASCII
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Mon, 17 Aug 2020 22:29:50 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 7341
Connection: close

BTW, my version is still available out there, and has been seeing a lot
of use, with many features not available in the master branch:
+ bulk downloads
+ resumption of aborted downloads (even if emacs crashes)
+ queue management
+ uses wget instead of w3m
+ see there for more

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