transition: mapnik 2.0.x

[Jérémy Lal]

(cc-ing to mapnik package)

Hi,

i am working on mapnik 2.2, and transitioning
libmapnik2-dev to libmapnik-dev

(side note, python-mapnik2 becomes a transitional
package in favor of python-mapnik).

Reverse build-dependencies seems to be limited to
monav-preprocessor 0.3-6+b1
node-mapnik 0.6.7-3

I am working on updating node-mapnik to 1.1 branch, and
will try to provide patches for monav-preprocessor.

Jérémy.