fix: issue2551193 - Fix roundup for removal of cgi and cgitb ... standard python modules (and FieldStorage/MiniFieldStorage). Vendor cgi.py and modify imports. Details: roundup/anypy/cgi_.py import that accesses a working cgi.py. All imports dealing with cgi now use cgi_. roundup/anypy/vendored/cgi.py vendored version 2.6 of cgi.py from: https://pypi.org/project/legacy-cgi/ CHANGES.txt change note added COPYING.txt added license for cgi.py doc/rest.txt change example to use cgi_ doc/upgrading.txt doc removal and how to rework local code using cgi.py. frontends/roundup.cgi remove unneeded cgi import roundup/cgi/actions.py roundup/cgi/apache.py roundup/cgi/client.py roundup/cgi/templating.py roundup/cgi/TAL/TALGenerator.py test/db_test_base.py test/rest_common.py test/test_cgi.py remove import cgi and replace with from roundup.anypy.cgi_ import cgi test/test_actions.py test/test_templating.py modify import to get *FieldStorage test/test_admin.py test/test_hyperdbvals.py test/test_xmlrpc.py remove unneeded cgi import