/reviewed-on !6

that can happen on the environment where UNO library is built with Python 2.

/cc @rafael @gabriel @kazuhiko 

/reviewed-on nexedi/cloudooo!5

unnecessary space change removed

So that both readme and changelog automatically render well on

https://lab.nexedi.com/nexedi/cloudooo  and on  
https://github.com/Nexedi/cloudooo

CHANGES is also renamed -> CHANGELOG along the way, because that's what
gitlab autodetects as changelog file name:

https://lab.nexedi.com/nexedi/gitlab-ce/blob/827d3914/app/models/repository.rb#L353

/cc @kazuhiko, @gabriel

/reviewed-on nexedi/cloudooo!3

writer_png_Export filter now works but draw_eps_Export and impress_eps_Export do not work.

also remove filters that now work from default black list.

also keep backward compatibility with a whitespace separated string that is provided by old ERP5 code.

that prevents detecting the end of unit test.

* use getDocumentProperties() and getUserDefinedProperties() instead of deprecated getDocumentInfo().
* use python3 syntaxes.

Fix issue to get mime type to ms.xlsx format. In this case, the format is splitted to try select a generic format

This script is copy/paste from erp5.git/product/ERP5Type/tests/backportUnittest.py. Then, I applied all changes from the same file to fix the issue.

This reverts commit da0b08a7.

This script is copy/paste from erp5.git/product/ERP5Type/tests/backportUnittest.py. Then, I applied all changes from the same file to fix the issue.