add tests/**/* in MANIFEST.in
move installation path of network xml files from /usr/share/libvirt/networks/ to /usr/share/miniascape/networks.d/
fix help text for the option -c/--confdir
add -confext option (but disabled now) to allow users choosing configuration file format in near future
split default/src.d/00_base.yml into some config files to sort out its contents
make the script to generate configuration files to load multiple config files from given dir instead of just loading single config file