Bug#182916: adding GFDL license and license manpages to base-files

[Matthias Klose <doko@cs.tu-berlin.de>]

ok on the GFDL, not agreeing on the man page for the GPL, which should
be included in the base files.

Manoj Srivastava writes:
> Hi,
> 
>         My stance has been that in order to be classified as common,
>  a license ought to be actually common -- say, a rule of thumb: be at
>  least used in 5% of the packages.
> 
> 	The rationale behind adding licenses to the common-licenses
>  category is to prevent excessive duplication of the license text, and
>  prevent useless waste of disk space; this saving in disk space is
>  supposed to offset the additional effort to determine what the
>  license is.
> 
> 	So, if there are at least 5% of the source packages (or
>  whatever number emrges from the debate that is sure to follow), we
>  can include the license into common license. A nice, objective
>  criteria for admission ;-)