Fold new entries into 0.2.6.3 changelog

changes/bug13796

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-  o Minor bugfixes:
-    - Use getsockname, not getsockopt, to retrieve the address for
-      a TPROXY-redirected connection. Fixes bug 13796; bugfix on 0.2.5.2-alpha.

changes/bug13993

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-   o Minor bugfixes (logging):
-       - Don't log messages to stdout twice when starting up. Fixes bug
-         13993; bugfix on 0.2.6.1-alpha.
-

changes/bug14184

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-  o Minor bugfixes:
-    - On the control port, the "entry-guards" command was reporting an "up"
-      status for a relay that was actually down. This fixes the check if
-      "unreachable_since" is set and if so reports the "down" status. Fixes
-      bug 14184; bugfix on 0.1.2.2-alpha.

changes/bug14759

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-  o Minor bugfixes (sandbox):
-    - Allow Glibc fatal errors to be sent to stderr before Tor exits.
-      Previously, glibc would try to write them to /dev/tty, and the sandbox
-      would trap the call and make Tor exit prematurely. Fixes bug 14759;
-      bugfix on 0.2.5.1-alpha.
-

changes/bug14764

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-  o Minor bugfixes (portability):
-    - Fix scheduler compilation on targets where char is unsigned.
-      Fixes bug 14764; bugfix on 0.2.6.2-alpha. Reported by Christian
-      Kujau.

changes/bug14802

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-  o Minor bugfix:
-    - Make an educated guess about how much memory the system has when our
-      detection functionality fails on some operating system.  Fixes bug 14802;
-      bugfix on 0.2.5.4-alpha.

changes/bug14819

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-  o Minor bugfixes
-    - Remove the --disable-threads configure option again. It was accidentally
-      partially re-introduced in 29ac883606d6d5ebfdcc2efceb2b4b60ee6a8916.
-      Fixes bug 14819; bugfix on 0.2.6.2-alpha.
-

changes/feature12844

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-  o Minor features:
-    - Introduce the config option Tor2webRendezvousPoints, which
-      allows clients in Tor2webMode to select a specific Rendezvous
-      Point to be used in HS circuits. This might allow better
-      performance for Tor2Web nodes. Implements ticket #12844.

changes/feature_13555

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-  o Deprecated versions:
-    - Tor relays older than 0.2.4.18-rc are no longer allowed to advertise
-      themselves on the network. Closes ticket 13555.

changes/remove_mempools

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-  o Removed features:
-    - The --enable-mempool and --enable-buf-freelists options, which
-      were originally created to work around bad malloc implementations,
-      no longer exist.  They were off-by-default in 0.2.5.  Closes
-      ticket 14848.