Enhancements to DBSTAT: (1) Make name=? queries efficient. (2) Add the

ability to aggregate results across each individual btree using the
aggregate=TRUE constraint in the WHERE clause.

FossilOrigin-Name: a48f6e17599d7ec794cfcd60858d6a69cf05caaae9321048b111fedd86a3b5b2

diff --cc manifest
index bf60fff9f824227d4a31443d4d886890dd43fae9,bb2af220b2ea14df1d1e7b9eb611eafa79917290..a78372bad49643d6ce1ea0f12c011630353bfde2
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Make\sthe\sresult\sof\ssqlite3_normalized_sql()\ssurvive\sits\sstatement\sbeing\sreprepared.
- D 2019-11-19T00:13:42.428
 -C Get\sthe\saggregate=TRUE\sfeature\sworking\son\sthe\sDBSTAT\svirtual\s\stable.
 -D 2019-11-19T18:48:11.254
++C Enhancements\sto\sDBSTAT:\s\s(1)\sMake\sname=?\squeries\sefficient.\s\s(2)\sAdd\sthe\nability\sto\saggregate\sresults\sacross\seach\sindividual\sbtree\susing\sthe\naggregate=TRUE\sconstraint\sin\sthe\sWHERE\sclause.
++D 2019-11-19T21:22:16.359
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  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
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diff --cc manifest.uuid
index af65542e3a55ff0a48f8ff9cb416bae9f1b7734c,c5fbc3246bb45c3feafd2f3c9735d5020b5ed839..f33aa3040946f36816df5fe3ecbd2299919aaccb
--- 1/manifest.uuid
--- 2/manifest.uuid
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