mxruntime_: use python and import m2ee

we can disable all the output except for the values/config
plugins/mxruntime_: remove sys.path.insert /usr/share/m2ee-tools

m2ee-tools provides a global python library since debian/0.5.3-2.
debian: add gbp.conf
debian/control: suggest python-m2ee
Update changelog for 0.3-1 release