Enhance sqlite3_rsync (in a backwards-compatible way) so that it has the

ability to send hashes for blocks of pages in addition to individual pages.
By judicious use of this capability, network bandwidth requirement to sync two
similar databases is reduced.

FossilOrigin-Name: e5d87aaa8fe1e8c8cb63813d26851183e77809a3d36e4c16c37f88b4b4724d6d

diff --cc manifest
index 96f52aa1fd509d8e732454ee7052e958cd452d3d,565a024081e13abb018801affc0ccdbf0ff6c242..1b3a9d2a063943129fbdd1ae9d0ee2fec95deaf4
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Do\snot\sallow\ssqlite3_rsync\sto\sconvert\sthe\sreplica\sfrom\sWAL-mode\sinto\nDELETE-mode,\sas\sthat\scan\sdisrupt\sexisting\sclients\son\sthe\sreplica\sside.\nDELETE-mode\sto\sWAL-mode\sconversions\sare\sallowed,\showever.\s\sSee\n[forum:/forumpost/6b575b66156673ee|forum\sthread\s6b575b66156].
- D 2025-05-02T11:18:09.023
 -C Improvements\sto\sprotocol\snegotiation.
 -D 2025-05-03T07:00:51.378
++C Enhance\ssqlite3_rsync\s(in\sa\sbackwards-compatible\sway)\sso\sthat\sit\shas\sthe\nability\sto\ssend\shashes\sfor\sblocks\sof\spages\sin\saddition\sto\sindividual\spages.\nBy\sjudicious\suse\sof\sthis\scapability,\snetwork\sbandwidth\srequirement\sto\ssync\stwo\nsimilar\sdatabases\sis\sreduced.
++D 2025-05-03T08:17:46.240
  F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@@ -2207,8 -2207,8 +2207,9 @@@ F tool/version-info.c 3b36468a90faf1bbd
  F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
  F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
- P 4b53603fe468c0c28b818762917e41bdd870de6d4cc143688f1cdea3136c81a4
- R 77c0a71cca6be2a9f28e992f31255bba
 -P 2a52b174e6e91cd7cfca0b20b39cdd231f377c7bc073f4223574556b94b16aa5
++P 660a035b6ce6684d429b882133e032181cc1664f4efadf1bc0e4ae27d45071c4 4f5a06e42010c3e047429f736ffb8e2e89a1eb599277c176945b57710f6713ca
+ R 2857adf0e10b56883ce6697a283afd6e
++T +closed 4f5a06e42010c3e047429f736ffb8e2e89a1eb599277c176945b57710f6713ca
  U drh
- Z 4ae06cab268d08247b608c21e7458e1c
 -Z c7d74e185dc3b48152bf82febe4de310
++Z c3005ffc7ac3fefab06e6e18950a9819
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 0d00d48c76d5540743061ce2e64ef821b7d1ecf5,f3b4164d07d57d842404f5eddb6c2c972acc7fda..b8cdd4302e9cf5553a5ec8840d3a92a23b826f18
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 660a035b6ce6684d429b882133e032181cc1664f4efadf1bc0e4ae27d45071c4
 -4f5a06e42010c3e047429f736ffb8e2e89a1eb599277c176945b57710f6713ca
++e5d87aaa8fe1e8c8cb63813d26851183e77809a3d36e4c16c37f88b4b4724d6d