Port to Six { Ongoing }

[anmol27katyani]

Progress goals under evaluation for #382 :

• fix a critical accidental dependency; remove the from jarabe.model import shell from src/sugar3/graphics/popwindow.py and use some other design,
• 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
• examples are tested
• Include old files with .bak for Backup
• port toolkit code in src/sugar3/activity,
• regenerate documentation,
• port make files, and test that "make install" installs both bindings,
• make local Fedora and Debian packages for testing by others.

[quozl]

#383 has already ported some of these files; I don't know how your changes fit together with those ones.

Were the tests run with python3? If not, you'll need other changes from #383.

Don't make .bak files, they make it impractical to review the changes in a pull request, and the old files are always available in git.

[rhl-bthr]

@octamois, the changes in this PR seem repititive
#383 already has all the changes, tested with Python3.

[quozl]

See my comment in issue #382.

[anmol27katyani]

@quozl noted
I saw that #383 was not merged, I will follow the prescribed method to avoid redundancy in upcoming stages.