Remove tx from AlreadyAskedFor list once we receive it, not when we process it.
Fixes ignored qt 4.8 codecs path on windows when configuring with --with-qt-libdir
[Qt] ensure all class attributes are init to 0

- in BitcoinGUI and UnitDisplayStatusBarControl
[Qt] use BitcoinGUI::DEFAULT_WALLET constant in bitcoin.cpp
[Qt] disable tray interactions when client model set to 0

- this prevents the ability to fiddle around with the system tray when
  already shutting down (e.g. on slow shutdowns because of a proxy delay)
- extends solution for #4360
Simplify serialize.h's exception handling

Remove the 'state' and 'exceptmask' from serialize.h's stream implementations,
as well as related methods.

As exceptmask always included 'failbit', and setstate was always called with
bits = failbit, all it did was immediately raise an exception. Get rid of
those variables, and replace the setstate with direct exception throwing
(which also removes some dead code).

As a result, good() is never reached after a failure (there are only 2
calls, one of which is in tests), and can just be replaced by !eof().

fail(), clear(n) and exceptions() are just never called. Delete them.
Add a getutxos command to the p2p protocol. It allows querying of the UTXO set
given a set of outpoints.
Add boolean HaveWatchonly and signal NotifyWatchonlyChanged
[Qt] Add column Watch-only to transactions list
[Wallet] Improve ReorderTransactions(..)
ui_interface: remove unused NotifyBlocksChanged signal
Create new signal for notification of new blocks.  Use w/ -blocknotify
Clean-up SyncWithWallets/SyncTransaction
gui: remove redundant numTransactions tracking

This number was still tracked even though it's shown nowhere in the UI
anymore. It was originally removed because it didn't match the actual number of
records in the view (which contains outputs, not transactions) thus was
confusing people.
addrman: Do not propagate obviously poor addresses onto the network
Add bitcoin-tx tests

Testing: delin, delout, locktime, and basic createrawtransaction-like
functionality.
Remove link to now removed Windows Build Notes

Removed in
Merge pull request #4736

5d9f22b Remove link to now removed Windows Build Notes (Michael Ford)
Merge pull request #4733
depends: add a fallback path in case package sources go missing

If a source url fails to download, try again at
$FALLBACK_DOWNLOAD_PATH/file.name, where FALLBACK_DOWNLOAD_PATH can be
overridden by the user.