Fixes for push corner case TAH found a bug where push would push things the remote already had, raising an assertion. This turned out to be because the changeset protocol was not recording a common subset node in one case. Also discovered was that the protocol was queueing multiple copies of a node for pull. Fixed by changing fetch to a hash. Add some more debugging output.

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    <title>#desc|firstline|escape#</title>

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    <link>#url#?cmd=changeset;node=#node#</link>

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    <description><![CDATA[#desc|escape|addbreaks#]]></description>

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    <author>#author|obfuscate#</author>

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    <pubDate>#date|rfc822date#</pubDate>

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