Add instance skeleton from the new-install-branch.

skel/Extensions/README.txt

+Files containing Python source code for External Method should be
+placed in this directory.  A freshly created instance should only
+contain this README.txt file in this directory.

skel/Products/README.txt

+Additional products for your Zope instance should be installed in this
+directory.  A freshly created instance should only contain this
+README.txt file in this directory.

skel/README.txt

+This directory contains an "instance home" for the Zope application
+server.  It contains the following directories:
+
+  bin/         Scripts used to control the Zope instance
+  etc/         Configuration files
+  Extensions/  Python sources for External Methods
+  log/         Log files
+  Products/    Installed products specific to the instance
+  var/         Run-time data files, including the object database

skel/bin/runzope.in

+#! /bin/sh
+
+PYTHON="<<PYTHON>>"
+ZOPE_HOME="<<ZOPE_HOME>>"
+INSTANCE_HOME="<<INSTANCE_HOME>>"
+
+CONFIG_FILE="$INSTANCE_HOME/etc/zope.conf"
+
+PYTHONPATH="$ZOPE_HOME/lib/python"
+export PYTHONPATH
+
+exec "$PYTHON" "$ZOPE_HOME/bin/runzope.py" -C "$CONFIG_FILE" "$@"

skel/bin/zopectl.in

+#! /bin/sh
+
+PYTHON="<<PYTHON>>"
+ZOPE_HOME="<<ZOPE_HOME>>"
+INSTANCE_HOME="<<INSTANCE_HOME>>"
+
+CONFIG_FILE="$INSTANCE_HOME/etc/zope.conf"
+
+PYTHONPATH="$ZOPE_HOME/lib/python"
+export PYTHONPATH
+
+ZDCTL="$ZOPE_HOME/bin/zopectl.py"
+
+exec "$PYTHON" "$ZDCTL" -C "$CONFIG_FILE" "$@"

skel/import/README.txt

+This directory is used by the running Zope process to import objects
+into the ZODB.  Please place any files that you wish to be able to
+import into this directy.  For more information, please see The Zope
+Book.

skel/log/README.txt

+This is the directory used to hold log files by default.

skel/var/README.txt

+This directory contains files created and maintained by the Zope
+application server and related utilities while the server is running.
+This can include the object database as well as supplemental files
+(such as "pidfiles").  Log files are normally stored in the log/
+directory in the instance home.