Use the --package argument to brand upgrade

When running make upgrade-database from an extension, pass in the name
of the extension so that the user is prompted to answer "What RT::IR
version are you upgrading from".
Don't always hardcode etc/

When running --action upgrade rt-setup-database wants to look in
etc/upgrade and this would prevent that.
Ship a make upgrade-database target

If your extension contains an etc/upgrade directory, we'll attempt to
use rt-setup-database's upgrade action.
Merge branch 'make-upgrade'
Note what we're merging down for 0.32
bump version to 0.32