logilab-astng #53142 fix relative and absolute import [open]

right now, handling absolute import seems to work only by mistake:

• I added recently:

  if sys.version_info >= (2, 7):
     absolute_import_activated = lambda self: True
  

  I thought, it should be alright, but it breaks in Pylint the test "func_3k_removed_stuff_py_30"

  It might be alright that he doesn't warn:

  W:  6: Relative import 'func_w0302', should be 'input.func_w0302'
  

  but we should have instead a import failure...

• py3k: the only test that does not pass in python3 is unittest_regrtest.NonRegressionTC.test_module_path : indeed the problem seems not to resolve something like:

  from . import hello
  

  there is no test about it, and it is the 2to3 script that lets us discover the problem:

  astng $ 2to3 test/regrtest_data/package/__init__.py
  
  -import subpackage
  +from . import subpackage
  

Pylint ticket http://www.logilab.org/ticket/6646 about false positives might also be related to import handling errors; maybe also http://www.logilab.org/ticket/20066