installation: lxml instead of pyRXP

* Removes pyRXP from the packages installed but will still pick as first
  choice as lxml doesn't have quite the same behaviour w.r.t. errors.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
global: 4suite removal

* Removes 4suite.

* Assumes lxml is installed as it should.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
jsonalchemy: documentation release
jsonalchemy: documentation and PEP8 fixes

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>