eliminate writeln et comp?

[Fawzi Mohamed]

after some extra digging

tango licensing:

BSD (and this is the revised 3 clause BSD)
- is compatible with GPL
- copyright need to be advertised also in the documentation and binary

a commonly used permissive license (which probably you are using when 
linking for example network code in almost any operating system).
It does *not* include the original fourth statement of BSD

APL
- similar to BSD, but with some extra protections against the liability 
of the licenser, in particular with respect to patents
- these extra restrictions make it incompatible with GPLv2
- it should be equivalent to apache 2.0 ( 
http://www.opensource.org/proliferation-report )
and so it might be compatible with GPLv3 but I am not 100% sure on this.

In any case the double licensing of tango allows one to use it also 
with GPL code

Fawzi