Approx proxy server configuration editor

 Config::Model::Approx Perl module provides a configuration checker and
  editor for /etc/approx/approx.conf.
 .
 When libconfig-model-tkui-perl is installed, running 'cme edit approx'
 will launch a graphical configuration editor for Approx configuration
 file.
 .
 cme can also be run to check configuration (cme check approx) or
 migrate older configurations without user interaction (cme migrate
 approx)