Add the kvtest.c test program used to show that it is many times faster to

read thumbnail and similar BLOBs out of an SQLite database than it is to read
them as separate files from the filesystem.

FossilOrigin-Name: 8074d59cf177cb91ee371e2660f2c59ce540b7e2

diff --cc manifest
index 7dd19b6bf373a2a717f8a401abd73429a12362a0,30efa070226c5f75dfa18a89552ce7fc315efce4..70c7ebc070f9486974da948fc03b2c026fc7d398
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Do\snot\sallow\sthe\snockpt.test\smodule\sto\srun\sunder\sthe\sinmemory_journal\npermutation.
- D 2016-12-27T15:59:15.338
 -C Add\smore\sdetail\sto\sthe\sheader\scommand\sto\sfurther\sexplain\show\sto\scompile\sand\nuse\sthe\skvtest.c\sutility.
 -D 2016-12-29T16:49:22.977
++C Add\sthe\skvtest.c\stest\sprogram\sused\sto\sshow\sthat\sit\sis\smany\stimes\sfaster\sto\nread\sthumbnail\sand\ssimilar\sBLOBs\sout\sof\san\sSQLite\sdatabase\sthan\sit\sis\sto\sread\nthem\sas\sseparate\sfiles\sfrom\sthe\sfilesystem.
++D 2016-12-29T16:58:01.454
  F Makefile.in 41bd4cad981487345c4a84081074bcdb876e4b2e
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
  F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@@ -1539,7 -1540,7 +1540,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 7854bee260996087bdb7f8729ba8cfb4f467f93f
- R 0002370ca7e07ee4867da4a22905f821
 -P e2bbeae7e77cde531885ca492494a02e5322154d
++P a6af06f164b1f65779e2171ec4946119c66f9be8 55d29839c9fafe9e6a694f5790151d1f22396b01
+ R 7016508fdc58bb08d2b99836c37fbfc4
++T +closed 55d29839c9fafe9e6a694f5790151d1f22396b01
  U drh
- Z 948aac4cd107424288db7dcd7f723dea
 -Z 4f0078fee62bc1e424f0bd1372e59e1a
++Z 23505d55f5d4f936007bea728155ea61

diff --cc manifest.uuid
index 5dc63da2649d8a4fda259f517b125c0d1a8089ed,37f0c85bf8f1b8600121e969e3a9e88ce0fe17dd..8059e9f0eea3a787d1430b8eaf4c6bc548f78389
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- a6af06f164b1f65779e2171ec4946119c66f9be8
 -55d29839c9fafe9e6a694f5790151d1f22396b01
++8074d59cf177cb91ee371e2660f2c59ce540b7e2