The version based on config.mk has been finalized to include more
features:
* Build variables are now defined in config.ini.
* The ini system can self-reference other keys (up to several levels).
* Some config (namely `ENV` section) can be overrided by environment
variables.
* The installer is now more portable (ported to saturnin so far):
everything can be defined in config.ini
Make it
* more flexible,
* more readable,
* faster,
* take care of manpages (not fully done yet),
* take care of dist list,
* little bit more polished in various other things.