Add make equivalent on windows that uses sphinx-build from the buildout.

I haven't changed Makefile to use this sphinx-build in case is screws with whatever is used on docs.zope.org.

doc/make.bat

+@ECHO OFF
+
+REM Command file for Sphinx documentation
+
+set SPHINXBUILD=..\bin\sphinx-build
+set ALLSPHINXOPTS=-d .build/doctrees %SPHINXOPTS% .
+if NOT "%PAPER%" == "" (
+	set ALLSPHINXOPTS=-D latex_paper_size=%PAPER% %ALLSPHINXOPTS%
+)
+
+if "%1" == "" goto help
+
+if "%1" == "help" (
+	:help
+	echo.Please use `make ^<target^>` where ^<target^> is one of
+	echo.  html      to make standalone HTML files
+	echo.  dirhtml   to make HTML files named index.html in directories
+	echo.  pickle    to make pickle files
+	echo.  json      to make JSON files
+	echo.  htmlhelp  to make HTML files and a HTML help project
+	echo.  latex     to make LaTeX files, you can set PAPER=a4 or PAPER=letter
+	echo.  changes   to make an overview over all changed/added/deprecated items
+	echo.  linkcheck to check all external links for integrity
+	echo.  doctest   to run all doctests embedded in the documentation if enabled
+	goto end
+)
+
+if "%1" == "clean" (
+	for /d %%i in (.build\*) do rmdir /q /s %%i
+	del /q /s .build\*
+	goto end
+)
+
+if "%1" == "html" (
+	%SPHINXBUILD% -b html %ALLSPHINXOPTS% .build/html
+	echo.
+	echo.Build finished. The HTML pages are in .build/html.
+	goto end
+)
+
+if "%1" == "dirhtml" (
+	%SPHINXBUILD% -b dirhtml %ALLSPHINXOPTS% .build/dirhtml
+	echo.
+	echo.Build finished. The HTML pages are in .build/dirhtml.
+	goto end
+)
+
+if "%1" == "pickle" (
+	%SPHINXBUILD% -b pickle %ALLSPHINXOPTS% .build/pickle
+	echo.
+	echo.Build finished; now you can process the pickle files.
+	goto end
+)
+
+if "%1" == "json" (
+	%SPHINXBUILD% -b json %ALLSPHINXOPTS% .build/json
+	echo.
+	echo.Build finished; now you can process the JSON files.
+	goto end
+)
+
+if "%1" == "htmlhelp" (
+	%SPHINXBUILD% -b htmlhelp %ALLSPHINXOPTS% .build/htmlhelp
+	echo.
+	echo.Build finished; now you can run HTML Help Workshop with the ^
+.hhp project file in .build/htmlhelp.
+	goto end
+)
+
+if "%1" == "latex" (
+	%SPHINXBUILD% -b latex %ALLSPHINXOPTS% .build/latex
+	echo.
+	echo.Build finished; the LaTeX files are in .build/latex.
+	goto end
+)
+
+if "%1" == "changes" (
+	%SPHINXBUILD% -b changes %ALLSPHINXOPTS% .build/changes
+	echo.
+	echo.The overview file is in .build/changes.
+	goto end
+)
+
+if "%1" == "linkcheck" (
+	%SPHINXBUILD% -b linkcheck %ALLSPHINXOPTS% .build/linkcheck
+	echo.
+	echo.Link check complete; look for any errors in the above output ^
+or in .build/linkcheck/output.txt.
+	goto end
+)
+
+if "%1" == "doctest" (
+	%SPHINXBUILD% -b doctest %ALLSPHINXOPTS% .build/doctest
+	echo.
+	echo.Testing of doctests in the sources finished, look at the ^
+results in .build/doctest/output.txt.
+	goto end
+)
+
+:end