Improved IMFApp

[Hans Ronne]

I have checked in the improved IMFApp that I have been working on recently.
It no longer needs 1 GB of memory and 45 minutes to load imf.dir (well,
things were not quite that bad, but almost).

A large number of other problems have been fixed as well, which are listed
in the ChangeLog.

If you wonder what IMFApp is, it's the small image editor that comes with
Xconq. In retrospect, I ask myself why I put a lot of work into improving
an application that I guess only a handful of people ever use. But here it
is, nonetheless ...

Hans