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/tango-icon-theme/template

@@ -0,0 +1,29 @@
+# Template build file for 'tango-icon-theme'.
+pkgname=tango-icon-theme
+version=0.8.90
+distfiles="http://tango.freedesktop.org/releases/$pkgname-$version.tar.gz"
+build_style=gnu_configure
+configure_args="--enable-png-creation"
+short_desc="Standard icon theme called tango"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=6e98d8032d57d818acc907ec47e6a718851ff251ae7c29aafb868743eb65c88e
+long_desc="
+ The Tango Desktop Project exists to help create a consistent graphical
+ user interface experience for free and Open Source software. This is an
+ icon theme that follows the Tango visual guidelines."
+
+noarch=yes
+gtk_iconcache_dirs="/usr/share/icons/Tango"
+triggers="gtk-icon-cache"
+
+Add_dependency build pkg-config
+Add_dependency build intltool
+Add_dependency build ImageMagick
+Add_dependency build icon-naming-utils
+Add_dependency full  librsvg
+
+pre_build()
+{
+	cd / && ${XBPS_TRIGGERSDIR}/pango-modules run post-install
+	cd $wrksrc
+}