Fix tyop

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Make it possible to associate the launcher with file extensions in Linux

Pointed out by Vassilis Kehayas (but it was %f instead of %F).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Offer Drag 'n Drop of images onto the Linux desktop icon

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge branch 'linux-icon'

This fixes a couple of issues around the .desktop files that are written
in Linux by default.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>