Merge implementation of SQL window functions from the exp-window-functions

into trunk.

FossilOrigin-Name: 17198a1206e2fbc9e555881468e8c6980b00e25b5b78a6798a6264ca7384f1ca

diff --cc manifest
index d2ee330fdfb2012d37f672ef21538fefb9bd9d2d,ba53e9c7cf9291a894224d9068f89c972f56579f..00f96876f7b70ae39da9aeac48d046b8a1d20521
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,10 -1,10 +1,10 @@@
- C Improved\scontext\sfor\serror_log\smessage\scoming\sfrom\ssqlite3_prepare().
- D 2018-06-21T23:53:54.653
 -C Fix\sa\sminor\sproblem\sin\sthe\scode\sfor\sdetermining\swhether\sor\snot\san\sSQL\nstatement\sis\sSQLITE_TOOBIG.
 -D 2018-06-30T20:00:35.632
++C Merge\simplementation\sof\sSQL\swindow\sfunctions\sfrom\sthe\sexp-window-functions\ninto\strunk.
++D 2018-06-30T20:15:58.324
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diff --cc manifest.uuid
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--- 1/manifest.uuid
--- 2/manifest.uuid
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