Remember out-of-order block headers along with disk positions. This is
likely the simplest and least-impact way to make -reindex work with
headers first.

Based on top of bitcoin#4468.

Instead of skipping to the last reindexed block in each file (which could
jump over processed out-of-order blocks), just skip each already processed
block individually.

Previous refactorings broke the ability to rebuild the chainstate by deleting the chainstate
directory, resulting in an incorrect "Incorrect or no genesis block found" error message. Fix
that.

Also, improve the performance of ActivateBestBlockStep by using the skiplist to only discover
a few potential blocks to connect at a time, instead of all blocks forever - as we likely bail
out after connecting a single one anyway.

There's only one case where a vector containing a fundamental type is
serialized all-at-once, unsigned char. Anything else would lead to
strange results.

Use a dummy argument to overload in that case.

There's only one user of this form of serialization, so it can be easily
dropped. It could be re-added if desired when we switch to c++11.

This allows CECKey to be used without directly depending on the secure
allocators

Also add a test to verify.

5f4bcf6 boost: drop boost dependency in version.cpp. (Cory Fields)
352058e boost: drop boost dependency in utilstrencodings.cpp (Cory Fields)
e1c9467 boost: drop boost dependency in core.cpp (Cory Fields)
e405aa4 boost: remove CPrivKey dependency from CECKey (Cory Fields)
5295506 boost: drop dependency on tuple in serialization (Cory Fields)
1d9b86d boost: drop dependency on is_fundamental in serialization (Cory Fields)

Related bitcoin#4993

7d41e6f Merge upstream LevelDB 1.18
803d692 Release 1.18

git-subtree-dir: src/leveldb
git-subtree-split: 7d41e6f

e8ea0fd MOVEONLY: CInPoint from core to txmempool (jtimon)

Remove CBaseChainParams::NetworkID()

…t the message contains sensitive information. This keeps the message from being output to the debug log by bitcoind. Fixes a possible security risk when starting bitcoind in server mode without the 'rpcpassword' option configured, resulting in the "suggested" password being output to the debug log.

6f155bd Add LIBTOOLFLAGS CXX tag to qt makefile include (Michael Ford)

e11b2ce Fix large reorgs (Pieter Wuille)
afc32c5 Fix rebuild-chainstate feature and improve its performance (Pieter Wuille)
16d5194 Skip reindexed blocks individually (Pieter Wuille)
ad96e7c Make -reindex cope with out-of-order blocks (Wladimir J. van der Laan)
e17bd58 Rename setBlockIndexValid to setBlockIndexCandidates (Pieter Wuille)
1af838b Add height to "Requesting block" debug (R E Broadley)
1bcee67 Better logging of stalling (R E Broadley)
4c93322 Improve getheaders (sending) logging (R E Broadley)
f244c99 Remove CheckMinWork, as we always know all parent headers (Pieter Wuille)
ad6e601 RPC additions after headers-first (Pieter Wuille)
341735e Headers-first synchronization (Pieter Wuille)

… from CScripts

This allows for a reversal of the current behavior.

This:
CScript foo;
CScriptID bar(foo.GetID());

Becomes:
CScript foo;
CScriptID bar(foo);

This way, CScript is no longer dependent on CScriptID or Hash();

This should move to a util header once their dependencies are cleaned up.

…56k1'

This probably would've broken native OSX builds