Improvements to the OP_SeekScan optimization. Added the

SQLITE_TESTCTRL_TUNE test-control.

FossilOrigin-Name: 9a2ab6092d644fc3effc4ab4aca33efb2b4dd4213b2154d518a3e87eec4d3983

diff --cc manifest
index fa9275c78afd495fcb431f18cc9efb3e82a0bc53,090e8d63c05f43dac916d39f4090f5cd8fa6f7c9..6673710696585a18e5f7d93259d77ad4662ea478
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\sthe\s(missing)\sdependency\sof\sregexp.c\sto\sthe\sshell.c\srule\sin\sthe\smakefiles.\nThis\sdependency\sshould\shave\sbeen\sadded\sby\s[5d4535bfb603d7c8]\sbut\swas\smissed.
- D 2021-06-04T16:17:38.971
 -C Revamp\sSQLITE_TESTCTRL_TUNE\sto\sprovide\svisibility\sof\scurrent\sturning\nparameter\svalues.
 -D 2021-06-04T13:40:26.168
++C Improvements\sto\sthe\sOP_SeekScan\soptimization.\s\sAdded\sthe\nSQLITE_TESTCTRL_TUNE\stest-control.
++D 2021-06-04T17:47:08.529
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1918,7 -1918,7 +1918,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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  U drh
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++Z 1487fd9719459ccfb4970df5beff8402

diff --cc manifest.uuid
index c3528215b3a1562a8de8e76e23f5651f26411596,c98981a2aa3cfd8af5ee47ed3b83a94a4654f77e..75fc7295e429b430affdd687647973dc0637ec63
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- c93be7e66039e4c27b86f49d29f5c653cc6c02f6cbc6ad02d8bb1d32d0240863
 -677e645e69e1f06487c26da6671fc03f0fb89a0f8e0d35712e6bdcf7279bdfc4
++9a2ab6092d644fc3effc4ab4aca33efb2b4dd4213b2154d518a3e87eec4d3983