Add support for new operators in virtual tables: !=, IS, IS NOT, IS NULL, and NOTNULL.

FossilOrigin-Name: 3b7dbe9da90b7db336eed597a73a5364d8a691e57c1febd60908349f57a539ad

diff --cc manifest
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--- 1/manifest
--- 2/manifest
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@@@ -1,5 -1,5 +1,5 @@@
- C Fix\sharmless\scompiler\swarnings\sseen\swith\sMSVC.
- D 2017-09-09T00:51:36.496
 -C Refactor\snames\sof\sconstants\sand\sfunctions\sassociated\swith\sthe\sauxiliary\noperators\sfor\sxBestIndex.
 -D 2017-09-11T19:47:37.315
++C Add\ssupport\sfor\snew\soperators\sin\svirtual\stables:\s!=,\sIS,\sIS\sNOT,\sIS\sNULL,\sand\sNOTNULL.
++D 2017-09-11T20:54:54.464
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diff --cc manifest.uuid
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