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Addresses #1832 Add DB_TRUNCATE_WITHCURSORS flag to db->truncate.  Will allow truncate while cursors open.

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add unique_checks option to db-benchmark-test to show the excessive splitting and merging bug. addresses #1828

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Merge 1781 back to main line. Closes #1781 (since #1781 involves creating a test.) There is a bug exposed by the x2.tdb test, but actually making the x2 test run right is a separate issue (Refs #1823).
{{{
svn merge -r 12282:12548 https://svn.tokutek.com/tokudb/toku/tokudb.1781
}}}


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I thought that the merge was implicated for making nodes too big, but now I'm convinced it's not.

When the brt tries to merge two nodes (maybe_merge_pinned_leaf_nodes) it has two cases
 1) The nodes combined are more than 3/4 a node, in which case it balances the nodes.
 2) Otherwise it merges them.  Hence merged nodes are always smaller than a node.

So I'm considering #1802 and #1811 to be fully resolved.

Refs #1802.  Closes #1811


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