Another attemps to make python 2 build work

Author: Sylvain MARIE

.travis.yml

@@ -18,14 +18,12 @@ env:
 
 before_install:
   # (a) linux dependencies
-  - sudo apt-get install pandoc  # only for python 2 build see below
   - sudo apt-get install ant
   - sudo apt-get install ant-optional  # for junitreports
 
 install:
   - pip list
-  - pip install setuptools_scm  # apparently python 2 does not support that it is installed simultaneously with pytest-cases
-  - pip install six pypandoc        # again just for python 2 build because it uses an old pytest-cases that needs it
+  - pip install setuptools_scm  # the old pytest-cases and makefun that we use are not universal wheels, this is required by their setup.py
   - pip install pytest_cases==1.10.1  # again just for python 2 !
   - python ci_tools/py_install.py pip ci_tools/requirements-pip.txt
   # this does not work anymore on python 2 so lets only do it when needed