www/py-webtest: Move www/py-WebTest to www/py-webtest

• Use lowercase PORTNAME and path
• Bump PORTREVISION of dependent ports for dependency change
• While I'm here, fix py-zope.testbrowser

error in zope.testbrowser setup command: 'install_requires' must be a string or list of strings containing valid project/version requirement specifiers; Expected end or semicolon (after name and no valid version specifier)

pytz > dev
     ^

• Error code 1

Stop.
make: stopped in /usr/ports/devel/py-zope.testbrowser