New -dev tasks

[Sylvestre Ledru <sylvestre.ledru@inria.fr>]

Hello,

>From time to time, I am trying to add more packages into Debian science
blend.
However, I am always stuck when dealing with libraries. When I am adding
a library dealing with physics, I would prefer to add it into a
physics-dev category (and this would be probably the case with all the
libraries).
For a lambda user, applications and libraries are two very different
things.

I would like to know if we could create a -dev tasks for each category
and move libraries into.

Regards,
Sylvestre