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Keep track of which block is being requested (and to be requested) from
each peer, and limit the number of blocks in-flight per peer. In addition,
detect stalled downloads, and disconnect if they persist for too long.

This means blocks are never requested twice, and should eliminate duplicate
downloads during synchronization.

Limit the number of orphan blocks in memory

v0.9 release notes formatting fixes

de21e8f1 build: Make sure historical release notes end up in distributions (Wladimir J. van der Laan)

12edce56 Update the address for downloading libpng (Micha)

The FTP server what we get libpng from only keeps the latest version in its main folder. Older versions are in the "history" folder. Apparently version 1.6.9 has been released, so 1.6.8 has moved to the history folder.

505867ac -Wl,-z,relro and -z,now were wiping out environmental LDFLAGS passed in by the user. I moved them to HARDENING_* where they belong. (Midnight Magic)

I moved them to HARDENING_* where they belong.

Typo fix: `anonimized => anonymized` + `infromation => information`

[Qt] Fix nTransactionFee in qt-settings

added missing homebrew qt dependency on mac osx build documentation.

65615a3a Gitian fixes for 0.9.0rc1 build (Wladimir J. van der Laan)

- Add 'g++' package (virtualbox images don't have this by default)
- Workaround for determinism in Qt5 resources
- Pass --disable-maintainer-mode --disable-dependency-tracking to
  configure for libqrencode to avoid random errors about missing m4
  directory
- Fix typo -with-pic -> --with-pic

It is not necessary to rebuild dependencies after this commit.
Fixes #3610 and #3612.

In case the total number of orphan blocks in memory exceeds a limit
(currently set to 750), a random orphan block (which is not
depended on by another orphan block) is dropped. This means it will
need to be downloaded again, but it won't consume memory until then.

Adds the historical release notes to release tarballs and windows
installers.

69baec96 doc: Add historical release notes (Wladimir J. van der Laan)

c117d9e9 Support for error messages and a few more rejection reasons (Luke Dashjr)
14e7ffcc Use standard BIP 22 rejection reasons where applicable (Luke Dashjr)

Add all known release notes for versions since 0.3.12,
thanks to Matt Corallo for collecting them on the wiki.

Don't define BUILD_DATE at all when no git version information
is available. `version.cpp` will then define it for us correctly
to the last commit date.

This has been fixed and broken many times over 0.9 history
(21cc8bdc, ef1e984e), please don't touch this code unless you plan
on testing all possible scenarios including gitian builds.

Fixes #3570.

c32a486f Add more data-driven tests. (Matt Corallo)

Just for completeness. Only a few messages changed or moved since last time.

Don't change any translatable messages until 0.9 final unless really necessary.

df966d1b log parameter interactions to debug.log (Philip Kaufmann)

Prepare block connection logic for headers-first

Commit a22eed6a got reverted in a RPC documentation update, redo it.

`bitcoin-qt --help` was missing a final newline.

.rc's should be linked into the executable directly,
not through a helper library.

4412c5a7 Fix `getaddednodeinfo` RPC call with dns=false (Wladimir J. van der Laan)

The getaddednodeinfo RPC call, when invoked with the dns flag set to
false, returns a malformed JSON object with duplicate keys.

Change this to return an array of objects with one key as
shown in the help message.

Fixes #3581.

69d03bc6 qt: Fix tab order in send and receive tab (Wladimir J. van der Laan)
79fb0557 [Qt] minor receive tab improvements (Cozz Lovan)