Support Ubuntu's lack-of-full-upgrade

Use dist-upgrade instead of full-upgrade when using apt on Ubuntu
Fix full-upgrade for any configuration

full- vs dist- upgrade is based upon apt, not the release.
Default to aptitude and dist-upgrade. These are safe.
Arguably, apt-get is a safer default than aptitude.
Fixed test for lsb_release
Replaced call to external basename with parameter expansion

Also removed the reference to $me parameter, since it took up valuable
main memory.
Merge branch 'release/v2'