netpbm: Removal from IPFire

netpbm: Removal from IPFire

- This is an addon whose purpose is defined as :-
   Netpbm is a toolkit for manipulation of graphic images, including conversion of images
   between a variety of different formats. There are over 300 separate tools in the
   package including converters for about 100 graphics formats. Examples of the sort of
   image manipulation we're talking about are: Shrinking an image by 10%; Cutting the top
   half off of an image; Making a mirror image; Creating a sequence of images that fade
   from one image to another.
- None of the above seems to be a purpose related to a Firewall. Additionally it is
   available in a huge number of distributions, including Linux, BSD,Windows,
   MacOS X/Darwin, Solaris, AIX etc
- This package seems to be better used on a system in the lan protected by IPFire than
   used on IPFire itself

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>