get rid of ZPL 2.0 license text. ZopePublicLicense.txt is taking over

doc/LICENSE.txt

-Zope Public License (ZPL) Version 2.1
-
-A copyright notice accompanies this license document that
-identifies the copyright holders.
-
-This license has been certified as open source. It has also
-been designated as GPL compatible by the Free Software
-Foundation (FSF).
-
-Redistribution and use in source and binary forms, with or
-without modification, are permitted provided that the
-following conditions are met:
-
-1. Redistributions in source code must retain the
-   accompanying copyright notice, this list of conditions,
-   and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the accompanying
-   copyright notice, this list of conditions, and the
-   following disclaimer in the documentation and/or other
-   materials provided with the distribution.
-
-3. Names of the copyright holders must not be used to
-   endorse or promote products derived from this software
-   without prior written permission from the copyright
-   holders.
-
-4. The right to distribute this software or to use it for
-   any purpose does not give you the right to use
-   Servicemarks (sm) or Trademarks (tm) of the copyright
-   holders. Use of them is covered by separate agreement
-   with the copyright holders.
-
-5. If any files are modified, you must cause the modified
-   files to carry prominent notices stating that you changed
-   the files and the date of any change.
-
-Disclaimer
-
-  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS''
-  AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
-  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
-  AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
-  NO EVENT SHALL THE COPYRIGHT HOLDERS BE
-  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-  DAMAGE.
-