TODO:
	write more automated test-cases
	implement extractcontrol.c properly
	allow to specify a keyring to use.
	allow to specify which keys are accepted for include and includedsc.
	moving files between distributions
	- only those with source in given thing...
	add override-support while updating (or decide if this should be done)
	add support to specify the key used for signing
		(allow it needing a passphrase)
	extend FilterFormula, FilterList et al to specify type/architecture/component
	switch to only include if source is present

far goals:
	check for source of package, 
	      for sources without packages.
	      for unmeet Dependencies
	      for unmeet Build-dependencies.
	switch to only include a package if no binaries from an older
		source of this package would be left.
	write dokumentation, some examples
	update for use with newer gpgpme
