install.sh: install a frozen Girocco::Config.pm file
Take advantage of the new Girocco::Dumper FreezeConfig
functionality and emit a frozen Girocco::Config.pm file
during the installation process that contains solely
variable assignments plus umask sanitation.
In addition provide all of the computed var_...=... variable
settings in the frozen Girocco::Config.pm as well to
make them available from within perl code.
This change provides a minor efficiency gain when
loading the Girocco::Config after installation.
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>