Split gsu.

Split gsu.

This patch splits the gsu file into two files for config parsing and
subcommand handling respectively.  Each part may be used independently
of the other.

Moreover, all scripts which use gsu now include the needed parts
directly rather than relying on the shell to have already sourced
the needed gsu files. This shortens bash startup time and makes gsu
easier to use for people whose login shell is not bash.