Make the Python interpreter easier to configure

Python is a bit dependant on the installation/distribution. For example
in older Ubuntus, python2.7 is not the default. Other distributions
don't use the version in the binary. To overcome these problems there
was an incomplete support to install the command to use a particular
python binary, but this didn't work if the "building" environment wasn't
using python 2.7 as the default Python interpreter.

This commit is intended to fix this, by using `make PYTHON=mypython`.
Use fpm to create the debian package

Using the regular debian infrastructure to create the packages is very
overwhelming. Also, one debian directory should be used for each
debian/ubuntu distribution, which is way out of the scope of this tool.

If at some point a serious debian/ubuntu packages wants to make proper
packages, he/she can do so in an external repository, this is how
normally debian packaging works.

To do this some stuff about version numbers and released had to be
adjusted too.