Add SQL scalar function rtreecheck() to the rtree module. For running checks to ensur...

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diff --cc manifest
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- D 2017-10-25T16:14:12.910
 -C Fix\scompilation\sissue\s(C99-ism)\sseen\swith\sMSVC.
 -D 2017-10-25T18:00:58.356
++C Add\sSQL\sscalar\sfunction\srtreecheck()\sto\sthe\srtree\smodule.\sFor\srunning\schecks\sto\sensure\sthe\sshadow\stables\sused\sby\san\srtree\svirtual\stable\sare\sinternally\sconsistent.
++D 2017-10-25T18:01:58.383
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