Major changes to not depend on cksum and db from NetBSD.

Two new utilities in C have been created:
	- xbps-digest: shows the SHA256 hash for a file.
	- xbps-pkgdb: handles dependency stuff via proplib.

Templates should use now $build_depends and change $checksum to be
a SHA256 hash. That means that I'm currently using xbps on Linux and
I lost interest on NetBSD, perhaps I'll add support for it in the
future.

Only git and its dependencies have been converted, as well as vim.

--HG--
extra : convert_revision : 53a7e030ca6b6d02bb6cd3e51d42b7d5702c1b57

README

@@ -7,10 +7,20 @@ Multiple versions of a package can be installed, because they can be enabled
 or disabled at the master directory anytime, to e.g allow testing different
 versions of the same package by "stowning" or "unstowning" them.
 
+xbps uses proplib, a property container object library and it's almost the
+same one available for NetBSD. Be sure to have it installed before using
+xbps. You can get it at:
+
+http://code.google.com/p/portableproplib/
+
 ------------------------------------------------------------------------------
  HOW TO USE IT
 ------------------------------------------------------------------------------
 
+Before using xbps, some required utilities need to be built and installed into
+the utils/ directory. You can do this by issuing a "make" command in the
+top level directory.
+
 Once you download it, you should edit the configuration file located at the
 xbps directory. By default it uses the xbps directory in your $HOME.