Add an initial implementation of the "PRAGMA optimize" command.

FossilOrigin-Name: 137aeb2b160888100bc1e871b00860149e5f6196

diff --cc manifest
index 084b50ff08baccd807645462babeb1d80fbdec88,3143c0ded64532fe2640ae79aad13fcf32094f65..6e1234fc6997e196885b83abf8451a9cf665bfc7
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C If\sa\sreprepare\sis\sneeded\safter\sbinding\sto\sa\svariable\swith\sa\snumber\slarger\nthan\s32,\sset\sonly\sthe\shigh-order\sbit\sof\sthe\sVdbe.expmask\srather\sthan\ssetting\nall\sbits.\s\sThis\scould\spotentially\sresult\sin\sfewer\sfalse-positive\sreprepares.
- D 2017-03-03T21:51:40.099
 -C Merge\supdates\sfrom\strunk.
 -D 2017-03-06T11:39:34.004
++C Add\san\sinitial\simplementation\sof\sthe\s"PRAGMA\soptimize"\scommand.
++D 2017-03-06T17:33:58.293
  F Makefile.in edb6bcdd37748d2b1c3422ff727c748df7ffe918
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc a89ea37ab5928026001569f056973b9059492fe2
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diff --cc manifest.uuid
index 9ee7804d6187c3c41567c0206a1a180c09389496,1bffbf3076040f8f6075d1237b3d85b935a82e7d..c68e3d13a82e9ac608d779f2836b6bf784fe9557
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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