For 'zipfile', detect attempts to cause a duplicate entry via UPDATE. Also, fix...

FossilOrigin-Name: b36caeca91647616ac2ccdb281200c1a8bcd15d1f30dda0c1d89440d54607196

diff --cc manifest
index 4bd7953ed9a855831924df17e2d96f3928998466,2f317cd34d80762849ab8194a70f31702e487377..2dc3feea2edd0aa41262f8f4f993b80952a8e1fb
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Avoid\sunnecessary\swrite\sto\sthe\ssqlite_sequence\stable\swhen\san\sinsert\nis\sdone\sinto\san\sautoincrement\stable\swith\san\sapplication-specified\srowid\nthat\sis\sless\sthan\sthe\smaximum.
- D 2018-03-20T13:44:10.070
 -C Fix\shandling\sof\s"UPDATE\sOR\sREPLACE"\sstatements\srun\son\szipfile\svirtual\stables.
 -D 2018-03-20T13:26:01.034
++C For\s'zipfile',\sdetect\sattempts\sto\scause\sa\sduplicate\sentry\svia\sUPDATE.\s\sAlso,\sfix\shandling\sof\s'UPDATE\sOR\sREPLACE'\sstatements\srun\son\szipfile\svirtual\stables.\s\sWin32\sportability\sfixes\sto\sthe\s'fileio'\sextension.\s\sMiscellaneous\stest\sfixes.
++D 2018-03-20T16:56:12.064
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F Makefile.in 7016fc56c6b9bfe5daac4f34be8be38d8c0b5fab79ccbfb764d3b23bf1c6fff3
@@@ -1712,8 -1712,7 +1712,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P ae34edb7f4fa7b37a66cdf3a1d851980cb013e9abe72bdeca23e5323051e0646 3e3849a9d1a06673e6c713a42194f5da339fbf6533fa418c38f63d09bc045867
- R b14ad23178f33348049b37fe5dfca3b5
- T +closed 3e3849a9d1a06673e6c713a42194f5da339fbf6533fa418c38f63d09bc045867
- U drh
- Z 2e0c8bc153c99ae88009245613a69afa
 -P 7834cf6c28c63f6ca0e29a508c0f6e3ec9c5c48715344c2db99a9866e92ef205
 -R 0676d2c36dd5dc602d3c6343c630c1e9
 -U dan
 -Z 67bd751f2f713e6278cdb7ebdf4ff3a3
++P ec7addc87f97bcff3c3694b14a680453b52de3f8c106436f0708a1cc04b90faa 9a5ef341de2bd2fc4657a510f48159f7876f58d340b457b4272a71d389f88da3
++R 1e4df846035bbcb340ca288f329df6a5
++T +closed 9a5ef341de2bd2fc4657a510f48159f7876f58d340b457b4272a71d389f88da3
++U mistachkin
++Z 2140b1494b49e09f4697bfddad075bea

diff --cc manifest.uuid
index be127d7703137345070bc2a6598844dc42c7c432,a74146b09513484ca048b9820c7446d66c56934d..1262402dd1b9baa76c47772b9d8089722b46989d
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- ec7addc87f97bcff3c3694b14a680453b52de3f8c106436f0708a1cc04b90faa
 -9a5ef341de2bd2fc4657a510f48159f7876f58d340b457b4272a71d389f88da3
++b36caeca91647616ac2ccdb281200c1a8bcd15d1f30dda0c1d89440d54607196