Avoid copying undo data
Fixing 'vector out of bounds' issue in base 32 and 64
Merge pull request #4944

018cec7 Fixing 'vector out of bounds' issue in base 32 and 64 (ENikS)
Apply clang-format on some infrequently-updated files
Merge pull request #4835

ab15b2e Avoid copying undo data (Pieter Wuille)
test: Fix DoS tests after c74332c

Fix data structure mismatch ... The mind boggles that they were still passing at all.
Add warning about the merkle-tree algorithm duplicate txid flaw

Lots of people read the Bitcoin Core codebase to learn more about
crypto; better to warn about flaws explicitly so they don't blindly copy
the code for other uses and create broken systems.
Merge pull request #4933

20e01b1 Apply clang-format on some infrequently-updated files (Pieter Wuille)
Merge pull request #4950

33a2771 test: Fix DoS tests after c74332c (Wladimir J. van der Laan)
Merge pull request #4952

01c2807 Add warning about the merkle-tree algorithm duplicate txid flaw (Peter Todd)
remove code below asserts in limitedmap.h (fixes a ToDo)