Updates to Makefile include:
* add targets: deb-src, deb-src-upload, deb-upload
* add variables to control DEB building: DEBUILD_OPTS, DPUT_OPTS, DEB_PPA, DEB_DIST, DEB_RELEASE
* create deb files for all release values in DEB_DIST
Several updates to packaging/debian/*
* Updated control file
* Whitespace/formatting of changelog
Add deb-build to .gitignore
