Merge the covering-index-scan optimization into trunk.

FossilOrigin-Name: ddd5d789e7ae4a66cd7b7fa79e48d2777f95350b

diff --cc manifest
index 0e71cfb7e7348a38411a221e644c10c9dec65403,fd4846b9d6428341e8ed681d3f0acf56e486f8fe..ba71fd957eaf871b27fa86404d3c8c4526f95c94
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Silence\sharmless\scompiler\swarning\sseen\swith\sSQLITE_OMIT_DEPRECATED.
- D 2012-09-18T23:21:32.844
 -C Make\ssure\sthe\sWHERE_IDX_ONLY\sflag\sis\snot\sset\son\squery\splans\sthat\swill\snot\nbe\susing\san\sindex.
 -D 2012-09-17T21:24:01.339
++C Merge\sthe\scovering-index-scan\soptimization\sinto\strunk.
++D 2012-09-19T00:35:31.172
  F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
  F Makefile.in 5f4f26109f9d80829122e0e09f9cda008fa065fb
  F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@@ -519,8 -520,7 +520,8 @@@ F test/in.test 5941096407d8c133b9eff15b
  F test/in2.test 5d4c61d17493c832f7d2d32bef785119e87bde75
  F test/in3.test 3cbf58c87f4052cee3a58b37b6389777505aa0c0
  F test/in4.test 64f3cc1acde1b9161ccdd8e5bde3daefdb5b2617
- F test/incrblob.test 26fde912a1e0aff158b3a84ef3b265f046aad3be
 +F test/in5.test 99f9a40af01711b06d2d614ecfe96129f334fba3
+ F test/incrblob.test 34765fa6fb5d8e0f256fc7d6497c04b205398849
  F test/incrblob2.test edc3a96e557bd61fb39acc8d2edd43371fbbaa19
  F test/incrblob3.test aedbb35ea1b6450c33b98f2b6ed98e5020be8dc7
  F test/incrblob4.test 09be37d3dd996a31ea6993bba7837ece549414a8
@@@ -1015,7 -1014,7 +1016,7 @@@ F tool/vdbe-compress.tcl f12c884766bd14
  F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
  F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
  F tool/win/sqlite.vsix 67d8a99aceb56384a81b3f30d6c71743146d2cc9
- P 5ded9b68388f4024425c11f09b03529ac89454ce
- R 8ee6066863b4421bc9631f7846e15100
- U mistachkin
- Z 92a1a23d1a7ee985df165e62f42bd758
 -P ccb8ecc30c8e6c7760131250297c2e452bbac43b
 -R 954468a602d729e7590459a0c0d2a8fc
++P c5cee969322d14114e4136510c3891a2e743520d 698b2a28004a9a2f0eabaadf36d833da4400b2bf
++R 8da95659b7aa774aee09e1ca7926ee73
+ U drh
 -Z 17e6bbfde6ba16331a4c164b47402211
++Z aa8acee5d32b23220a1be1b14b7c681d

diff --cc manifest.uuid
index 6227346cb8c3fa14fada624b21a9390c8ec62ed9,6105b408ba8232aec9a5e6566cbd795dcdd70ee0..484bfb980b429e726e84c52268882bbbad56e8be
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- c5cee969322d14114e4136510c3891a2e743520d
 -698b2a28004a9a2f0eabaadf36d833da4400b2bf
++ddd5d789e7ae4a66cd7b7fa79e48d2777f95350b