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/iputils/patches/fix_install.diff

@@ -0,0 +1,17 @@
+--- Makefile.orig	2009-03-06 09:03:41.189028082 +0100
++++ Makefile	2009-03-06 09:08:37.087015943 +0100
+@@ -25,6 +25,14 @@ TAG:=`date +s%Y%m%d`
+ 
+ all: $(TARGETS)
+ 
++install:
++	for f in $(TARGETS); do						\
++		if [ "$$f" = "ping" -o "$$f" = "ping6" ]; then		\
++			install -D -m4755 $$f $(DESTDIR)/sbin/$$f;	\
++		else							\
++			install -D -m755 $$f $(DESTDIR)/sbin/$$f;	\
++		fi;							\
++	done
+ 
+ tftpd: tftpd.o tftpsubs.o
+ ping: ping.o ping_common.o