add "python" option to zope.conf schema allowing for a python binary to be specified, allowed a Zope instance to run from any buildout with the appropriate eggs.

necessarily the same as the one used to run mkzopeinstance.

a Zope 2 meta-egg

Simplified buildout configurations by removing references to '${buildout:eggs}'.
They are not needed because there is only one egg (Zope2) required for each part

They are not needed because there is only one egg (Zope2) required for each part.

over indexes if the result set is already empty.

- In ``skel/etc/zope.conf.ing``, replaced commented-out
  ``read-only-database`` option, which is deprecated, with pointers to the
   appropos sections of ZODB's ``component.xml``.

- Updated the description of the ``zserver-read-only-mode`` directive to
  indicate its correct semantics (suppressing log / pid / lock files).
  
- Added deprecation to the ``read-only-database`` option, which has had no
  effect since Zope 2.6.

- removed svn:external for 'bootstrap dir

  the user-permission report

- whitespace cleanup

Reverted r90443 and r90454. We keep the shopping cart tests working by including a copy of Examples.zexp.