bug#19360: Support for .adz=.adf.gz

[Thue Janus Kristensen]

I hereby propose a trivial patch to add support for recognizing .adz files.
.adz files are just a shorthand for .adf.gz , in the same way that .tgz is
a shorthand for .tar.gz .

The patch is very simple: One part to recognize that .adz is a gzipped file
format, and one part to rename the output file to .adf . I haven't added
auto-renaming to .adz when gzipping, because people not familiar with the
de facto standard might get confused, though adding support would be
trivial.

Documentation that .adz is a de facto standard for amiga floppy disk images:
* http://www.amigaforever.com/kb/13-112
* http://fileformats.archiveteam.org/wiki/ADF_(Amiga)
* http://pcsupport.about.com/od/fileextensions/f/adzfile.htm
* http://www.fileinfo.com/extension/adz
I have also been playing with my amiga emulator and games I found on the
Internet, and there were a significant number of .adz files.

As far as my google skills suffice, I can't find any other meaning than
"gzipped adf" for .adz, so there should be no unintended consequences:
https://www.google.com/search?q=adz+file

Regards, Thue

gzip-adz.patch
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