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/ntp/files/ntpd.cron-hourly

@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# Restarts ntpd if no connected peers are found.
+#
+ntpq_cmd=/usr/bin/ntpq
+ntpd_initd=/etc/init.d/ntpd
+
+if [ ! -x $ntpq_cmd -o ! -x $ntpd_initd ]; then
+	exit 0
+fi
+
+$ntpq_cmd -np | grep '^\*' >/dev/null || (/etc/init.d/ntpd restart)