Bitcoin-Qt: ensure all Windows scopes use win32 as identifier

- currently we sometimes use "windows" or "win32", but as per
  http://doc.qt.digia.com/qt/qmake-advanced-usage.html, windows seems to
  be not officially supported (only win32 is mentioned there)
Make output of gettxout RPC more consistent

* Report "value" in BTC, rather than "amount" in satoshis
* Use ScriptPubKeyToJSON to report script data
Move VerifySignature to main
Add CScriptCheck: a closure representing a script check
Remove CheckSig_mode and move logic out of CheckInputs()
Parallelize script verification

* During block verification (when parallelism is requested), script
  check actions are stored instead of being executed immediately.
* After every processed transactions, its signature actions are
  pushed to a CScriptCheckQueue, which maintains a queue and some
  synchronization mechanism.
* Two or more threads (if enabled) start processing elements from
  this queue,
* When the block connection code is finished processing transactions,
  it joins the worker pool until the queue is empty.

As cs_main is held the entire time, and all verification must be
finished before the block continues processing, this does not reach
the best possible performance. It is a less drastic change than
some more advanced mechanisms (like doing verification out-of-band
entirely, and rolling back blocks when a failure is detected).

The -par=N flag controls the number of threads (1-16). 0 means auto,
and is the default.
Remove contention on signature cache during block validation

Since block validation happens in parallel, multiple threads may be
accessing the signature cache simultaneously. To prevent contention:
* Turn the signature cache lock into a shared mutex
* Make reading from the cache only acquire a shared lock
* Let block validations not store their results in the cache
Bitcoin-Qt: fix known addressbook bugs

- add qSort() for cachedAddressTable, as qLowerBound() and qUpperBound()
  require the list to be in ascending order (see
  http://harmattan-dev.nokia.com/docs/library/html/qt4/qtalgorithms.html#qLowerBound)
- add a new check in AddressTableModel::setData() to just return, when no
  changes were made to a label or an address (prevents entry duplication
  issue)
- remove "rec->label = value.toString();" from
  AddressTableModel::setData() as the label gets updated by
  AddressTablePriv::updateEntry() anyway (seems @sipa added this line via
  https://github.com/bitcoin/bitcoin/commit/1025440184ef100a22d07c7bb543ee45cf169d64#L6R225)
- add another new check in AddressTableModel::setData() to just return, if
  a duplicate address was found (prevents address overwrite)
- add a new check to EditAddressDialog::setModel() to prevent setting an
  invalid model
- re-work the switch-case statement in AddressTableModel::accept() to
  always break (as return get's called anyway) and order the list to match
  the enum definition
- make accept() in editaddressdialog.h a public slot, which it should be
- misc small coding style changes
add InitMessage() to noui and use debug.log for GUI

- this pull adds an InitMessage() function to noui.cpp, which outputs init
  messages to debug.log (this allows to remove some printf() calls from
  init.cpp)
- change InitMessage() in bitcoin.cpp to also write init messages to
  debug.log to ensure nothting is missing in the log because of the
  removal of printf() calls in init.cpp
Merge pull request #2060 from sipa/parallel

Parallel script verification
Merge pull request #2149 from sipa/fixtxoutrpc

Make output of gettxout RPC more consistent
Merge pull request #2109 from Diapolo/qt-pro-file-win32

Bitcoin-Qt: ensure all Windows scopes use win32 as identifier
Merge pull request #2171 from Diapolo/init

add InitMessage() to noui and use debug.log for GUI
Merge pull request #2157 from Diapolo/Qt_addrlist

Bitcoin-Qt: fix known addressbook bugs