Major infrastructure changes, part 2.

* Moved helpers, common and triggers dirs into xbps-src, where
  they belong.
* Renamed the templates dir to srcpkgs, it was so redundant before.
* Make it possible to add subpkgs with no restriction in names, for
  example udev now has a subpkgs called "libgudev". Previously
  subpkgs were named "${sourcepkg}-${pkgname}".
* xbps-src: changed to look for template files in current directory.
  That means that most arguments from the targets have been removed.
* xbps-src: added a reinstall target, to remove + install.
* xbps-src: do not overwrite binpkgs by default, skip them.

And more that I forgot because it's a mega-commit that I've been
working for some days already...

--HG--
extra : convert_revision : 0f466878584d1e6895d2a234f07ea1b2d1e61b3e

xbps-src/etc/xbps-src.conf.in

@@ -3,14 +3,15 @@
 #
 
 #
-# Directory where XBPS has been installed. By default /usr/local.
+# Directory where xbps-src has been installed. By default /usr/local.
 #
 XBPS_INSTALLDIR=@@XBPS_INSTALL_PREFIX@@
 
 #
-# Directory where you downloaded the GIT xbps-src/templates repository.
+# Directory where the xbps-src GIT repository is available. This is
+# required to be mounted in the chroot.
 #
-XBPS_DISTRIBUTIONDIR=$HOME/xbps
+XBPS_DISTRIBUTIONDIR=$HOME/xbps-templates
 
 #
 # Master directory: this is where all packages files are copied from