This is a replacement for the jfif.datatype included in the
picture.datatype v43 distribution.

It is based on the latest IJG JFIF sources. So it supports
progressive jpeg-decoding and more. It seems to be a little
faster than the old Tower-Codec. But this has never been
tested by me.

I've written this datatype because of more and more progressive
jpeg-images appear in HTML-documents.

Another source of motivation was the "mini-war" which was
introduced by Ralph Schmidt who don't like our ProBench V3.0 to
simulate cybergfx-api calls. He forbids the usage of his datatype
together with our Merlin-Software. So I decided to be the nice
guy who does some work to support a software he isn't allowed to
use with his system.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                29654   52752  56.2% -lh5- fe38 Sep 17  1996 Classes/DataTypes/jfif.datatype
[generic]                 2138    4737  45.1% -lh5- 9494 Sep 17  1996 prodev_jfifdt.doc
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files   31792   57489  55.3%            Sep 17  1996