Alphabetize and update mime information for KDE 4.0.

In terms of saving:

1. TIFF:
a) Saving a TIFF to a QByteArray does not work (bug reported to Qt).
In pratical terms, KolourPaint's saving preview does not work.

b) Saving a QImage as a TIFF file always outputs TIFFs that are read back in by QImage as 24-bit (hence this commit adds no special mime info for TIFF).

2. Saving to video/x-mng does not work.