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/dhcpcd-gtk/patches/fix_install.diff

@@ -0,0 +1,28 @@
+--- mk/sys.mk.orig	2009-05-08 00:51:16.893203221 +0200
++++ mk/sys.mk	2009-05-08 00:51:27.419143271 +0200
+@@ -1,12 +1,12 @@
+ # Simple defaults
+ 
+-PREFIX?=	/usr/local
++PREFIX?=	/usr
+ 
+ BINDIR?=	${PREFIX}/bin
+ BINMODE?=	0755
+ NONBINMODE?=	0644
+ 
+-SYSCONFDIR?=	${PREFIX}/etc
++SYSCONFDIR?=	/etc
+ 
+ AR?=		ar
+ ECHO?=		echo
+--- src/dhcpcd-gtk/Makefile.orig	2009-05-08 00:55:08.417016098 +0200
++++ src/dhcpcd-gtk/Makefile	2009-05-08 00:55:21.242055585 +0200
+@@ -6,7 +6,7 @@ PROG=		dhcpcd-gtk
+ SRCS=		main.c menu.c prefs.c wpa.c
+ 
+ ICONDIR?=	${PREFIX}/share/dhcpcd/icons
+-SYSCONFDIR?=	${PREFIX}/etc/xdg/autostart
++SYSCONFDIR?=	/etc/xdg/autostart
+ FILESDIR?=	${SYSCONFDIR}
+ FILES=		dhcpcd-gtk.desktop
+