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

srcpkgs/tar/template

@@ -0,0 +1,20 @@
+# Template build file for 'tar'.
+pkgname=tar
+version=1.22
+distfiles="http://ftp.gnu.org/gnu/tar/$pkgname-$version.tar.bz2"
+build_style=gnu_configure
+short_desc="The GNU tape archiver with remote magnetic tape support"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=3cefb67f197a3f8f5235999fe749ced0889466a71ddcbc96fddca84e5d53aa4d
+long_desc="
+ GNU tar, originally shipped as NetBSD's \"tar\" up to version 1.3, is a
+ full-featured tar command that can access remote and local magnetic tapes,
+ tar files (ustar, POSIX, and V7), and even compressed or gzipped versions
+ of these.  Note that as of the current version of GNU tar (1.12), gtar
+ does not create "correct" ustar archives."
+
+base_chroot=yes
+
+Add_dependency run glibc
+Add_dependency full gzip
+Add_dependency full bzip2