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/which/template

@@ -0,0 +1,15 @@
+# Template file for 'which'
+pkgname=which
+version=2.20
+distfiles="http://www.xs4all.nl/~carlo17/which/which-$version.tar.gz"
+build_style=gnu_configure
+short_desc="Displays where a particular program in your path is located"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=d417b65c650d88ad26a208293c1c6e3eb60d4b6d847f01ff8f66aca63e2857f8
+long_desc="
+ The which command shows the full pathname of a specified program, if
+ the specified program is in your PATH."
+
+Add_dependency full glibc
+Add_dependency full bash
+Add_dependency build texinfo