Massive changes to allow installing pkgs in a chroot.

Some changes include:
 - Xstow is not used anymore, files are copied into masterdir.
 - a new target install-chroot has been created.
 - a new meta-template xbps-base-chroot has been created required for
   the install-chroot target.
 - Removed XBPS_SYSCONFDIR, /etc is used by default.
Other changes that I cannot remember right now...

--HG--
extra : convert_revision : fb57d9dafb56aeb03cc935580172e075ce584fd5

templates/linux-headers.tmpl

@@ -0,0 +1,14 @@
+# Template file for 'linux-headers'
+pkgname=linux-headers
+version=2.6.27.3
+wrksrc="linux-$version"
+distfiles="http://www.kernel.org/pub/linux/kernel/v2.6/linux-$version@.tar.bz2"
+build_style=only-install
+make_install_target="
+ INSTALL_HDR_PATH=$XBPS_DESTDIR/$pkgname-$version/usr
+ headers_install"
+short_desc="The Linux kernel headers"
+maintainer="Juan RP <xtraeme@gmail.com>"
+checksum=52d9526ea8df33c9fab3df4564b0147b1866c76b0fd31474b92592567384a02c
+long_desc="
+ This package provides the linux kernel headers for use in userspace."