Modules were installed with a duplicated prefix (and .sh.sh somewhat sucks).
md5sum module fixes.

	- No sum is generated if the only sources are directories (like
	  reposiroties).
	- An empty sum is generated if no sources are present (instead of
	  waiting for something to come from stdin…)
Support for VCS modules and directories as source entries.
Experimental git module backported from pkg++.
make module updated for more automation and less dependencies on configure().
$dirname is guessed during extraction/copy of files and not during right before building, for more precision.