Remove the hard-dep on six

It looks like it is no longer needed, but leaving it commented
until we do some more tests.
Add some notes about the package split.

* in description line
* in readme
* add each package crate icon and link.
Merge remote-tracking branch 'kali/hotfix/remove-six-hard-dep' into develop
Merge remote-tracking branch 'kali/bug/more-descriptive' into develop
Merge remote-tracking branch 'kali/hotfix/add_manifest_license' into develop
add bypass var for init files
Merge remote-tracking branch 'kali/bug/bypass-init-install' into develop
Use dirspec instead of plain xdg. Closes #3574.
Merge remote-tracking branch 'ivan/feature/3574_use-dirspec-instead-of-xdg' into develop
Use soledad.server namespace in init script
Merge remote-tracking branch 'chiiph/bug/fix_init_script' into develop
Fold in changes.
Merge branch 'release-0.3.2'