Port to Six

[quozl]

Port the Sugar Toolkit for GTK+ 3 to Six, providing both Python 2 and Python 3 bindings from this package.

Progress goals:

• fix a critical accidental dependency; remove the from jarabe.model import shell from src/sugar3/graphics/popwindow.py and use some other design,
• port C code in src/sugar3 none of the C files include Python,h,
• port toolkit code in src/sugar3 which calls C code, and test that the C code can be called from REPL,
• port toolkit code in src/sugar3/graphics,
• port graphics examples, and test that examples work,
• port toolkit code in src/sugar3/activity,
• port the Hello World activity,
• port all remaining toolkit code, such as src/sugar3/datastore, presence, bundle,
• port to TelepathyGLib,
• port make files, and test that "make install" installs both bindings,
• regenerate documentation,
• make local Fedora and Debian packages for testing by others.
• release new version of toolkit.

this is an issue for tracking a major project which is larger than one person's contributions, so developers should make pull requests to satisfy any of these items, and not ask to own the issue.

[Aniket21mathur]

* make local Fedora and Debian packages for testing by others.

Link to Debian packages (Python 2 version).
https://github.com/Aniket21mathur/sugar-toolkit-gtk3-packages