fix: revert back to setup.py + setup.cfg

apparently with python 3.6 things "mostly" work but then they break if
any specified dependencies have a dot in the name.  which in this
project, is the case for `zope.sqlalchemy`

so until we drop python 3.6 support, we cannot use pyproject.toml here

setup.cfg

@@ -0,0 +1,97 @@
+
+[metadata]
+name = Tailbone
+version = 0.11.0
+author = Lance Edgar
+author_email = lance@edbob.org
+url = http://rattailproject.org/
+license = GNU GPL v3
+description = Backoffice Web Application for Rattail
+long_description = file: README.rst
+classifiers =
+        Development Status :: 4 - Beta
+        Environment :: Web Environment
+        Framework :: Pyramid
+        Intended Audience :: Developers
+        License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+        Natural Language :: English
+        Operating System :: OS Independent
+        Programming Language :: Python
+        Programming Language :: Python :: 3
+        Programming Language :: Python :: 3.6
+        Programming Language :: Python :: 3.7
+        Programming Language :: Python :: 3.8
+        Programming Language :: Python :: 3.9
+        Programming Language :: Python :: 3.10
+        Programming Language :: Python :: 3.11
+        Topic :: Internet :: WWW/HTTP
+        Topic :: Office/Business
+        Topic :: Software Development :: Libraries :: Python Modules
+
+
+[options]
+packages = find:
+include_package_data = True
+install_requires =
+        asgiref
+        colander
+        ColanderAlchemy
+        cornice
+        cornice-swagger
+        deform
+        humanize
+        Mako
+        markdown
+        openpyxl
+        paginate
+        paginate_sqlalchemy
+        passlib
+        Pillow
+        pyramid>=2
+        pyramid_beaker
+        pyramid_deform
+        pyramid_exclog
+        pyramid_fanstatic
+        pyramid_mako
+        pyramid_retry
+        pyramid_tm
+        rattail[db,bouncer]
+        six
+        sa-filters
+        simplejson
+        transaction
+        waitress
+        WebHelpers2
+        zope.sqlalchemy
+
+
+[options.packages.find]
+exclude =
+        tests.*
+        tests
+
+
+[options.extras_require]
+docs = Sphinx; sphinx-rtd-theme
+tests = coverage; mock; pytest; pytest-cov
+
+
+[options.entry_points]
+
+paste.app_factory =
+        main = tailbone.app:main
+        webapi = tailbone.webapi:main
+
+rattail.cleaners =
+        beaker = tailbone.cleanup:BeakerCleaner
+
+rattail.config.extensions =
+        tailbone = tailbone.config:ConfigExtension
+
+
+[nosetests]
+nocapture = 1
+cover-package = tailbone
+cover-erase = 1
+cover-html = 1
+cover-html-dir = htmlcov