drop workaround for bitcoin v0.1.5
Revert "PPCoin: More stack trace dump during serialization"

This reverts commit 59f05238ced81a41dff7499b6b7e1699bdbf9629.

Conflicts:
	src/serialize.h
Revert "PPCoin: Stack trace dump for ReadCompactSize() exception"

This reverts commit 17382b40fae13629d0a7c77806bd9e73972f061d.

Conflicts:
	src/makefile.unix
	src/serialize.h
	src/util.cpp
	src/util.h
Reject non-canonically-encoded sizes

The length of vectors, maps, sets, etc are serialized using
Write/ReadCompactSize -- which, unfortunately, do not use a
unique encoding.

So deserializing and then re-serializing a transaction (for example)
can give you different bits than you started with. That doesn't
cause any problems that we are aware of, but it is exactly the type
of subtle mismatch that can lead to exploits.

With this pull, reading a non-canonical CompactSize throws an
exception, which means nodes will ignore 'tx' or 'block' or
other messages that are not properly encoded.

Please check my logic... but this change is safe with respect to
causing a network split. Old clients that receive
non-canonically-encoded transactions or blocks deserialize
them into CTransaction/CBlock structures in memory, and then
re-serialize them before relaying them to peers.

And please check my logic with respect to causing a blockchain
split: there are no CompactSize fields in the block header, so
the block hash is always canonical. The merkle root in the block
header is computed on a vector<CTransaction>, so
any non-canonical encoding of the transactions in 'tx' or 'block'
messages is erased as they are read into memory by old clients,
and does not affect the block hash. And, as noted above, old
clients re-serialize (with canonical encoding) 'tx' and 'block'
messages before relaying to peers.

Conflicts:
	src/main.cpp
	src/test/serialize_tests.cpp
Only send reorged txn to mempool after checkpoint

Conflicts:
	src/main.cpp
Fix multi-block reorg transaction resurrection

Conflicts:
	src/main.cpp
Revert "Partially revert "Remove broken option to skip input checking for wallet"

This reverts commit 7c2f170a5917037b9bdeabfe40eeee70cbb0533f.

Conflicts:
	src/main.cpp
	src/main.h
qt: get required locks upfront in polling functions

This avoids the GUI from getting stuck on
periodical polls if the core is holding the locks for a longer time -
for example, during a wallet rescan.

Conflicts:
	src/qt/transactiontablemodel.cpp
	src/qt/walletmodel.cpp