Better coverage

a conf. file has been defined for python2 and another for python3 to exclude code that is executed only with the other version. More tests are provided to reach 99% of coverage. The 1% left is the line calling the method specific to the other version of python.

if python2:
  method_for_python2
else:
  method_for_python3

job 71771 on old allgo has been archived, which make it inaccessible.