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/lvm2/files/lvm2.initramfs-local-top

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+PREREQ="mdadm mdrun multipath"
+
+prereqs()
+{
+	echo "$PREREQ"
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+[ ! -e /sbin/lvm ] && exit 0
+[ ! -e /dev/urandom ] && mknod /dev/urandom c 1 9
+
+modprobe -q dm-mod >/dev/null 2>&1
+if [ -e /sys/class/misc/device-mapper ]; then
+	echo "Scanning for Logical Volumes..."
+	eval /sbin/lvm vgscan --ignorelockingfailure
+	echo "Activating Logical Volumes..."
+	eval /sbin/lvm vgchange --ignorelockingfailure -ay
+fi
+exit $?