Fixed the following PEP-8 issues:

docs/codebase/conf.py:6:80: E501 line too long (80 > 79 characters)

docs/codebase/conf.py:9:80: E501 line too long (82 > 79 characters)

docs/codebase/conf.py:17:11: E401 multiple imports on one line

docs/codebase/conf.py:37:80: E501 line too long (80 > 79 characters)

docs/codebase/conf.py:39:80: E501 line too long (83 > 79 characters)

docs/codebase/conf.py:83:80: E501 line too long (80 > 79 characters)

docs/codebase/conf.py:179:80: E501 line too long (81 > 79 characters)

docs/manual/conf.py:6:80: E501 line too long (80 > 79 characters)

docs/manual/conf.py:9:80: E501 line too long (82 > 79 characters)

docs/manual/conf.py:45:80: E501 line too long (80 > 79 characters)

docs/manual/conf.py:99:80: E501 line too long (80 > 79 characters)

docs/manual/conf.py:197:80: E501 line too long (81 > 79 characters)

docs/manual/_ext/webapidocs.py:383:24: E126 continuation line over-indented for hanging indent

docs/manual/_ext/webapidocs.py:660:80: E501 line too long (80 > 79 characters)

docs/manual/_ext/webapidocs.py:866:1: E302 expected 2 blank lines, found 1

docs/manual/_ext/webapidocs.py:894:1: E302 expected 2 blank lines, found 1

docs/releasenotes/conf.py:6:80: E501 line too long (80 > 79 characters)

docs/releasenotes/conf.py:9:80: E501 line too long (82 > 79 characters)

docs/releasenotes/conf.py:38:80: E501 line too long (80 > 79 characters)

docs/releasenotes/conf.py:85:80: E501 line too long (80 > 79 characters)

docs/releasenotes/conf.py:183:80: E501 line too long (81 > 79 characters)

docs/releasenotes/_ext/extralinks.py:28:30: E713 test for membership should be 'not in'

Built docs, and pep8.