build: quit abusing LIBS for Windows builds.

Similar to the INCLUDES changes in 6b099402b40, split out LIBS into individual
entries for more fine-grained control.

Also add MINIUPNPC_LIBS which was missing before, and hook it up to
executables.
build: fix libtool's refusal to link static libs into a dll
Squashed 'src/leveldb/' changes from 7924331..7d41e6f

7d41e6f Merge upstream LevelDB 1.18
803d692 Release 1.18

git-subtree-dir: src/leveldb
git-subtree-split: 7d41e6f89ff04ce9e6a742932924796f69c6e23d
Merge src/leveldb changes for LevelDB 1.18.
Add CValidationInterface::BlockChecked notification
Bugfix: submitblock: Use a temporary CValidationState to determine accurately the outcome of ProcessBlock, now that it no longer does the full block validity check
Rename RPC_TRANSACTION_* errors to RPC_VERIFY_* and use RPC_VERIFY_ERROR for submitblock
rpc: Fix leveldb iterator leak, and flush before `gettxoutsetinfo`

This fixes an iterator leak resulting in

    bitcoind: db/version_set.cc:789: leveldb::VersionSet::~VersionSet(): Assertion `dummy_versions_.next_ == &dummy_versions_' failed."

exception on shutdown.

Also make sure to flush pcoinsTip before calling GetStats() to make
sure we apply them to the current height.
openssl version bump

Bumps the OpenSSL version to the latest release, and kills SSL2. (SSL3 was already killed here, so I'm not sure why SSL2 was left around?)

No other changes.
boost: split stream classes out of serialize.h

serialization now has no dependencies.
Update license in pull-tester and rpc-tests

Add missing copyright/license header where necessary
doc: release notes update for `rpcallowip` syntax change
qt: remove monitoreddatamapper

We haven't used the viewModified signal in ages, so we can use a normal
QDataWidgetMapper.
fix build with libc++ after 85c579e
Merge pull request #5128

3a757c5 fix build with libc++ after 85c579e (Cory Fields)

Signed-off-by: Gavin Andresen <gavinandresen@gmail.com>
Add doc/doxygen to .gitignore
Extend getchaintips RPC test.

Add the capability to simulate network splits to the RPC test framework
and use it to do more extensive testing of 'getchaintips'.
Work around #5113.
Clear vFixedSeeds for regtest network

It shouldn't inherit these from testnet.
(seems to be already done for unit test network but forgotten here...)
Fixes #5127.
Update comments in addrman to be doxygen compatible

Also correct the file license