Overhaul of EXPLAIN QUERY PLAN. The output is now in the form of a tree.

More details of the query plan are shown, and what is shown is truer to what
actually happens.

FossilOrigin-Name: ff01bbdabc4b9db3db8b928979442c91b32d72082158e4f5fe62ae51a73649d2

diff --cc manifest
index 866465edaf32e98fe925a38c9e91384d6b0c9c19,c007b732379288ea6a7760e4ab34885ae16a7d00..04373ccc9530da238156be5302d75a177bb89276
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Prevent\sVACUUM\sfrom\srunning\sany\scommands\sin\ssqlite_master.sql\sother\sthan\nCREATE\sstatements.\s\sThat\sis\sall\sthat\sshould\sbe\sthere\sanyhow.\s\sThis\sfixes\na\sproblem\sdiscovered\sby\sOSSFuzz.\s\sTest\scases\sin\sTH3.
- D 2018-05-02T15:00:26.033
 -C Optimizations\sto\sthe\snew\sEQP\sframework.
 -D 2018-05-03T19:47:14.896
++C Overhaul\sof\sEXPLAIN\sQUERY\sPLAN.\sThe\soutput\sis\snow\sin\sthe\sform\sof\sa\stree.\nMore\sdetails\sof\sthe\squery\splan\sare\sshown,\sand\swhat\sis\sshown\sis\struer\sto\swhat\nactually\shappens.
++D 2018-05-03T19:56:50.453
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  F Makefile.in 5ce9343cba9c189046f1afe6d2bcc1f68079439febc05267b98aec6ecc752439
@@@ -493,12 -493,12 +493,12 @@@ F src/printf.c d3b7844ddeb11fbbdd38dd84
  F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
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- F src/shell.c.in 54b902ab7d840f60ddfabc13124c85d4980342c88aff7679f2cc25f67c21ade7
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+ F src/shell.c.in 29309f2ab656c8817fbc3b7910b9af8464557b91cba75277a03669399c8e2730
 -F src/sqlite.h.in d669de545f18f2f01362de02e309cd7f15185958c71bac8f53cd5438b46d2bea
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  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
  F src/sqlite3ext.h 83a3c4ce93d650bedfd1aa558cb85a516bd6d094445ee989740827d0d944368d
- F src/sqliteInt.h 8ac0138eae10337b745b03dad0124fd63ae911c0503e795729503e7fc6234d57
+ F src/sqliteInt.h 7fbd839f07d873a877375138f2681453232e2e2de8f48be65888e295cd05ced3
  F src/sqliteLimit.h 1513bfb7b20378aa0041e7022d04acb73525de35b80b252f1b83fedb4de6a76b
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  F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
@@@ -562,12 -562,12 +562,12 @@@ F src/update.c 5be2f501ddc704fc04183bdb
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  F src/util.c d9eb0a6c4aae1b00a7369eadd7ca0bbe946cb4c953b6751aa20d357c2f482157
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+ F src/vdbe.h d970d9738efdd09cb2df73e3a40856e7df13e88a3486789c49fcdd322c9eb8a2
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  F src/vdbeapi.c 29d2baf9c1233131ec467d7bed1b7c8a03c27579048d768c4b04acf427838858
- F src/vdbeaux.c 944bae5207bbce456c466d01dcf2aac3ad49c957325d35c0ba7de882d3e5c25c
+ F src/vdbeaux.c 58129ae46be079613df5c2c3714d80a78605415bfa10c9528634c7c2d2147727
  F src/vdbeblob.c f5c70f973ea3a9e915d1693278a5f890dc78594300cf4d54e64f2b0917c94191
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  F src/vdbesort.c 731a09e5cb9e96b70c394c1b7cf3860fbe84acca7682e178615eb941a3a0ef2f
@@@ -1727,7 -1727,7 +1727,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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diff --cc manifest.uuid
index 1f86bdd5bb3f91f5f0233678c6752fe7a6e22af1,e64df66110bd579a8e7e79f943dc664c0afb373a..db0983069a2777d75dd8cd4dae81065c57d39e6f
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
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