Allow for page numbers as large as 4294967294 (0xfffffffe) which means

database files as large as 281 TB.

FossilOrigin-Name: 166e82dd20efbfd355ef3fb8b500bfebd8b946f1b13619b46722de96b57ed039

diff --cc manifest
index ac6aa6536a938309926c2d8cd1d088729195464a,9e4c34e9a5eb30216d76b78027000aeecec6c628..879d1713bfbfbaa795875573962ed52c1fb6e4f0
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C If\sa\swriter\scrashes\sin\sWAL\smode\sand\sleave\sthe\sSHM\sfile\sin\san\sinconsistent\sstate,\nsubsequent\stransactions\sare\snow\sable\sto\srecover\sthe\sSHM\sfile\seven\sif\sthere\sare\nactive\sread\stransactions.
- D 2020-07-28T17:29:13.292
 -C Fix\sunreachable\sbranches.
 -D 2020-07-30T17:14:55.498
++C Allow\sfor\spage\snumbers\sas\slarge\sas\s4294967294\s(0xfffffffe)\swhich\smeans\ndatabase\sfiles\sas\slarge\sas\s281\sTB.
++D 2020-07-30T17:29:39.908
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -1878,8 -1879,7 +1879,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
  F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
  F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P 73fecc688ab5c459245c9bb89432139a083ef378404b4dae3397a7f4e253f72a 2a251af84ff1f5ca281aa69c5410d6ae7aa5a85ef47149909a297525e1651e9d
- R 69a29ce092f5af857bcf59873f5056ae
- T +closed 2a251af84ff1f5ca281aa69c5410d6ae7aa5a85ef47149909a297525e1651e9d
 -P 1d69eee8b085d514f442840346f001b4785f8ec64f5ba66943e9577b26e2e29c
++P ee8a108058c304f9b6b02f84f1da01a0b7a3a21992627bcc1f97d42e8d23da69 905752da9815ff8242b3cb9a77b1ffdc5cfc76143f47c774890f617a542457a5
+ R e750109cf0648accd12ecb5530f24e6e
++T +closed 905752da9815ff8242b3cb9a77b1ffdc5cfc76143f47c774890f617a542457a5
  U drh
- Z f0509e0a6ac22a3eb269a4a65f129fe3
 -Z 4d1ff6cf3b2902d2c83733f58d9b4355
++Z 8808954f14f87ecdfc4e3db2afb14772

diff --cc manifest.uuid
index f9787d86e374b12de76c39343bace1d24c745868,b778ecf54c58c3ed3ce572dfa6d672faabec9a92..e431d010f68156f1348d468dcf04db00d6a2c303
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- ee8a108058c304f9b6b02f84f1da01a0b7a3a21992627bcc1f97d42e8d23da69
 -905752da9815ff8242b3cb9a77b1ffdc5cfc76143f47c774890f617a542457a5
++166e82dd20efbfd355ef3fb8b500bfebd8b946f1b13619b46722de96b57ed039