hgcia: remove hgcia (BC)
As discussed at:
https://www.mercurial-scm.org/pipermail/mercurial-devel/2016-March/081018.html,
cia service is down for years. It also uses socket.setdefaulttimeout() which
will break chg. This patch removes the extension.
py3: make raise statement python3 compatible
In python3
raise error, message
has been changed to
raise error(message)
In additional to that nodes.SkipNode is changed to nodes.SkipNode() so that
it creates an instance directly.
Added signature for changeset
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