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/file/template

@@ -0,0 +1,17 @@
+# Template file for 'file'
+pkgname=file
+version=5.03
+distfiles="ftp://ftp.astron.com/pub/file/$pkgname-$version.tar.gz"
+build_style=gnu_configure
+short_desc="File type identification utility"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=1edab47f9ef2ec5c021204f07566b11e5c2b3ae207af98137a021ac6e9bd95bb
+long_desc="
+ File attempts to classify files depending on their contents and prints
+ a description if a match is found."
+
+base_chroot=yes
+subpackages="file-devel"
+
+Add_dependency run glibc
+Add_dependency full zlib