Update docs. Correct errors reported by setup.py build_docs. Add rest interface and link to rest doc to features page. Add link to xmlrpc doc to features page. Add rest doc to index. Update rest doc, hopefully clarify confusing use of parameters in patch action section. Fix code examples in "Adding new rest endpoints" section. Fix example adding import of exception.

from roundup.dist.command.build import build_message_files, check_manifest
from distutils.command.install_lib import install_lib as base

class install_lib(base):

    def run(self):
        check_manifest()
        build_message_files(self)
        base.run(self)