" More refactoring of build-and-upload-tarballs.
* Split out the per-component and common PPAs into separate files.
* Added config settings to decide which PPA to install checkbox
and CDTS from.
* Added renaming of the tarball to reflect dev or testing.
* Removed all release specificity from build_iso function, moved it to
the per-release build functions.
Note that use of the multiple PPA functionality requires dpkg_offline
rev36 or newer.
[r=roadmr][bug=][author=roadmr]"