epytext errors in svn trunk, set up pydoctor buildbot

[mwh]

exarkun killed all of these a while back, but like weeds they are returning:

epytext error in Module 'twisted.python.modules'
epytext error in TwistedFunction 'twisted.python.modules._ModuleIteratorHelper.__getitem__'
epytext error in TwistedFunction 'twisted.protocols.smtp.encode_base64'
epytext error in TwistedFunction 'twisted.vfs.backends.adhoc.AdhocDirectory.child'
epytext error in TwistedFunction 'twisted.vfs.backends.inmem.FakeDirectory.child'
epytext error in TwistedFunction 'twisted.vfs.ivfs.IFileSystemContainer.child'
epytext error in TwistedFunction 'twisted.words.protocols.jabber.client.XMPPClientFactory'
epytext error in TwistedClass 'twisted.words.xish.domish.Element'
epytext error in TwistedClass 'twisted.web2.dav.xattrprops.xattrPropertyStore'
epytext error in TwistedClass 'twisted.web2.dav.resource.DAVPropertyMixIn'
epytext error in TwistedFunction 'twisted.web2.client.http.EmptyHTTPClientManager.clientPipelining'
epytext error in TwistedFunction 'twisted.web2.client.http.EmptyHTTPClientManager.clientPipelining'
epytext error in TwistedFunction 'twisted.web2.client.interfaces.IHTTPClientManager.clientPipelining'
epytext error in TwistedFunction 'twisted.web2.client.interfaces.IHTTPClientManager.clientPipelining'
epytext error in TwistedFunction 'twisted.mail.maildir.StringListMailbox.listMessages'
epytext error in TwistedFunction 'twisted.mail.pop3.IMailbox.listMessages'
epytext error in TwistedFunction 'twisted.mail.pop3.Mailbox.listMessages'
epytext error in TwistedFunction 'twisted.internet._dumbwin32proc._findShebang'
epytext error in TwistedFunction 'twisted.spread.jelly.Jellyable.jellyFor'
epytext error in TwistedFunction 'twisted.spread.jelly.Jellyable.jellyFor'
epytext error in TwistedFunction 'twisted.spread.flavors.RemoteCopy.unjellyFor'
epytext error in TwistedFunction 'twisted.spread.flavors.RemoteCache.unjellyFor'
epytext error in TwistedFunction 'twisted.spread.jelly.Jellyable.jellyFor'
epytext error in TwistedFunction 'twisted.spread.jelly.Jellyable.jellyFor'
epytext error in TwistedFunction 'twisted.spread.jelly.Unjellyable.unjellyFor'

Probably not that hard to fix, but more generally useful would be to set up a pydoctor buildbot that would turn red when this happens. I can donate time on a machine for this, but it needs to be done.

[glyph]

I certainly have no idea what could be done about this.

[exarkun]

#2640 is a duplicate of this, I suppose.