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/man-db/files/man-db.cron-daily

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# taken from Debian
+# man-db cron daily
+set -e
+
+if ! [ -d /var/cache/man ]; then
+    # Recover from deletion, per FHS.
+    mkdir -p /var/cache/man
+    chmod 755 /var/cache/man
+fi
+
+# regenerate man database
+/usr/bin/mandb --quiet
+
+exit 0
+