Merge the latest trunk enhancements into the sqlite3_stmt_explain branch.

FossilOrigin-Name: 06eae046c1a1155f22590b88942db72f01482f2363da9753f8adfdb322679055

diff --cc manifest
index 0926a795e7b3ce6b0e66d3d68d882dd3bb7bf8c9,575934e4e27288b4be578cb82229dacf4bcad4f7..059255339d6b508452c14a95379a117ef252031d
--- 1/manifest
--- 2/manifest
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@@@ -1,5 -1,5 +1,5 @@@
- C Enhance\sthe\ssqlite3_stmt_explain()\sinterface\sso\sthat\savoids\sunnecessary\nreprepare\soperations.
- D 2023-07-18T17:29:05.187
 -C Two\sminor\simprovements\sto\ssum(),\sone\sof\swhich\swas\sinspired\sby\n[forum:/forumpost/af5be98dbc|forum\spost\saf5be98dbc].
 -D 2023-07-19T09:52:10.467
++C Merge\sthe\slatest\strunk\senhancements\sinto\sthe\ssqlite3_stmt_explain\sbranch.
++D 2023-07-19T10:17:42.983
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diff --cc manifest.uuid
index ab125fc443e40419dee495acf24737fb75b20a01,4a5750f1d246f89e271a216d30dcb9634b912e63..24e5dc90bc1bb7e8deb8543a00793567013ed4e2
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--- 2/manifest.uuid
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