Add the ability to read from read-only WAL-mode database files as long as

the -wal and -shm files are present on disk.

FossilOrigin-Name: 00ec95fcd02bb415dabd7f25fee24856d45d6916c18b2728e97e9bb9b8322ba3

diff --cc manifest
index 8e5a1ee43f04a5607b6f50916fe738531976ea2d,50ac558bb2ee90beb8d2a2c4fb94e6ea27e55483..f1fb27c3db6aea2ac5bc7080e503d54b7afb6a1c
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,8 -1,8 +1,8 @@@
- C Fix\sthe\sSQLITE_ENABLE_UPDATE_DELETE_LIMIT\sfunctionality\sso\sthat\sit\sworks\swith\sviews\sand\sWITHOUT\sROWID\stables.
- D 2017-11-14T17:06:37.824
 -C Improvement\sto\sa\scomment.\s\sNo\schanges\sto\scode.
 -D 2017-11-14T03:42:52.056
 -F Makefile.in 5bae3f2f3d42f2ad52b141562d74872c97ac0fca6c54953c91bb150a0e6427a8
++C Add\sthe\sability\sto\sread\sfrom\sread-only\sWAL-mode\sdatabase\sfiles\sas\slong\sas\nthe\s-wal\sand\s-shm\sfiles\sare\spresent\son\sdisk.
++D 2017-11-14T19:34:22.764
 +F Makefile.in b142eb20482922153ebc77b261cdfd0a560ed05a81e9f6d9a2b0e8192922a1d2
  F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 -F Makefile.msc 3a5cb477ec3ce5274663b693164e349db63348667cd45bad78cc13d580b691e2
 +F Makefile.msc a55372a22454e742ba7c8f6edf05b83213ec01125166ad7dcee0567e2f7fc81b
  F README.md f5c87359573c4d255425e588a56554b50fdcc2afba4e017a2e02a43701456afd
  F VERSION 0c10cdfed866fdd2d80434f64f042c3330f1daaed12e54287beb104f04b3faaf
  F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
@@@ -466,16 -459,16 +466,16 @@@ F src/pcache1.c 716975564c15eb6679e97f7
  F src/pragma.c d04725ac25387d9638919e197fb009f378e13af7bf899516979e54b3164e3602
  F src/pragma.h bb83728944b42f6d409c77f5838a8edbdb0fe83046c5496ffc9602b40340a324
  F src/prepare.c 7cf451f903ad92a14e22de415a13e7a7d30f1bd23b3d21eeb0dc7264723244c5
- F src/printf.c 40aee47ae9be4bd3dbdc8968bd07fddc027be8edec8daddf24d3391d36698a1c
+ F src/printf.c 9506b4b96e59c0467047155f09015750cb2878aeda3d39e5610c1192ddc3c41c
  F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 -F src/resolve.c 5a461643f294ec510ca615b67256fc3861e4c8eff5f29e5940491e70553b1955
 +F src/resolve.c 5b1e89ba279f4a4ab2f0975a7100d75be71e1a43a2df75a9c909d45bdd18c6ed
  F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
  F src/select.c 660ef7977841fb462f24c8561e4212615bb6e5c9835fd3556257ce8316c50fee
  F src/shell.c.in 08cbffc31900359fea85896342a46147e9772c370d8a5079b7be26e3a1f50e8a
- F src/sqlite.h.in 6d96f09aac30a030c7674a47659d8156263d2ccad1aa5dae23a723f7166a0c37
 -F src/sqlite.h.in df0f3e18bd7210a562dfa4dc7c5b8f57058dfd0f51d771feb5fcfbe3d6ccae5b
++F src/sqlite.h.in 8fd97993d48b50b9bade38c52f12d175942c9497c960905610c7b03a3e4b5818
  F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
  F src/sqlite3ext.h c02d628cca67f3889c689d82d25c3eb45e2c155db08e4c6089b5840d64687d34
 -F src/sqliteInt.h f5377febf86654c975e1d4e4353a5ad2fbaa5bc86b584ba3761ed33e24ce2c0e
 +F src/sqliteInt.h abd4e64bc72906449d801d0e211265525239bc021bd9b7a72143c281fc24fa03
  F src/sqliteLimit.h 1513bfb7b20378aa0041e7022d04acb73525de35b80b252f1b83fedb4de6a76b
  F src/status.c 9737ed017279a9e0c5da748701c3c7bf1e8ae0dae459aad20dd64fcff97a7e35
  F src/table.c b46ad567748f24a326d9de40e5b9659f96ffff34
@@@ -550,13 -543,13 +550,13 @@@ F src/vdbesort.c 731a09e5cb9e96b70c394c
  F src/vdbetrace.c 48e11ebe040c6b41d146abed2602e3d00d621d7ebe4eb29b0a0f1617fd3c2f6c
  F src/vtab.c 0e4885495172e1bdf54b12cce23b395ac74ef5729031f15e1bc1e3e6b360ed1a
  F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
- F src/wal.c cc9b1120f1955b66af425630c9893acd537a39d967fd39d404417f0a1b4c1579
+ F src/wal.c beeb71e4eab65dbf0d95f2717efc6ca3c0f5b3090ce67f3de63828f39a6ff053
  F src/wal.h 8de5d2d3de0956d6f6cb48c83a4012d5f227b8fe940f3a349a4b7e85ebcb492a
  F src/walker.c d591e8a9ccf60abb010966b354fcea4aa08eba4d83675c2b281a8764c76cc22f
 -F src/where.c b7a075f5fb3d912a891dcc3257f538372bb4a1622dd8ca7d752ad95ce8949ba4
 +F src/where.c 031a80bcafe93934fd7052f3031c9e7eb36b61754c6c84d6bf0833184abad3db
  F src/whereInt.h 82c04c5075308abbac59180c8bad5ecb45b07453981f60a53f3c7dee21e1e971
  F src/wherecode.c 4a117dd5886616d074f7b6589c23bf742f5a9858d6ffdaf8b9d1f76ab06245d2
 -F src/whereexpr.c afcac9cccfc0fdaccbdda94034a398947b6dc47dbf821c1b496261722832a6a4
 +F src/whereexpr.c 427ea8e96ec24f2a7814c67b8024ad664a9c7656264c4566c34743cb23186e46
  F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
  F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
  F test/affinity3.test 6a101af2fc945ce2912f6fe54dd646018551710d
@@@ -1675,7 -1669,7 +1677,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 3711ef2366af8fefccaaa0a6ee520ce6bc9c74a4fe0666f0a85ef96be46e02d3 72be33f9c84de3ec4afc40549482417456ca82c1d16b473dc034b144055271e5
- R 4965ea97eeaee748543d2aea665dda83
- U dan
- Z 07c3ca1d0e3a6855fa6ef907209d6a9f
 -P 9c6b38b9a96c11bdf9db4ea025720a4f49dcb723fa2e2776edc8453bce85c7e3
 -R 696f834341714d48762ee99cfc8345fc
++P dae4a97a483bee1e6ac0271ddd28a0dffcebf7522edaf12eb5e0eba5fc62516a 486949fc03706e0056439b52ce60931ea4ce0a65e391da7f6287fe13862de251
++R 4dd08ae7170c8d270fe307a98bb5bfb2
++T +closed 486949fc03706e0056439b52ce60931ea4ce0a65e391da7f6287fe13862de251
+ U drh
 -Z 27bc2b0f1009e1afc7034f11c759006b
++Z 1fe131254421255cb83ffd7abf325441

diff --cc manifest.uuid
index 6e9e37365d06538a2deffe260e952429571b8908,b0b16a61f78ebbecbf596b39a5183c1f980afdd5..1aae26850e9d947d18548432b90e1efac79a8c89
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- dae4a97a483bee1e6ac0271ddd28a0dffcebf7522edaf12eb5e0eba5fc62516a
 -486949fc03706e0056439b52ce60931ea4ce0a65e391da7f6287fe13862de251
++00ec95fcd02bb415dabd7f25fee24856d45d6916c18b2728e97e9bb9b8322ba3

diff --cc src/sqlite.h.in
Simple merge