Establish git-buildpackage upsream branch

Eliminate the debian directory from the build.
Update README for setup.py
Update Changelog for email and setup.py
README: Fix python build instr. and home page
Accept 'attachment' keyword in mailto, as well as 'attach'
Fix tests
Support email user names containing '+'s
Setting default mailer - refer as XDG id instead of (possibly localized) name
Minor gettext cleanup
Update cs.po from Launchpad
Add hr.po from Launchpad
Add ru.po to Launchpad
Add pt_BR to po
Add Indonesian (id.po) translation file
Add another Chinese translation file (zh_TW)
setup.py: Improve clean

Delete the 'mo' and 'scripts-2.7' directories in 'build' on clean.
Delete the 'debian/clean' file.
control: Add master branch to Vcs-git
control: Fix home page
PO files updated

updated using intltool-update. Had to delete hr, cs, and ru for now
because they reported errors.
Merge branch 'upstream' for 1.8.3