url_substitute: Switch to GSList from lr_List + remove list module.
lrmirrorlis: New module. GLib2 ready replacement for the internal_mirrorlist module.
README.md: Add note about glib env vars for better testing with valgrind.
test: Run python unittest verbosely
Librepo migrated to lr_LrMirrorlist from lr_InternalMirrorlist.
downloadtarget: New module, future replacement for curltarget module.
rcodes: Changed layout
utils: Add cleanup.sh script.