Remove tx from AlreadyAskedFor list once we receive it, not when we process it.
[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
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
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.
Move UpdateTime to pow
Move CBlockIndex::GetBlockWork() to pow::GetProofIncrement(nBits)
replace ComputeMinWork with CheckMinWork
build: osx: Fix incomplete framework packaging for codesigning

Starting with 10.9, Framework versions must be signed individually, rather
than as a single bundle version, in order to be properly codesigned. This
change ensures that the proper plist files and symlinks are present prior to
packaging.
contrib/linearize: Guarantee that output is generated in-order

This was typically ensured implicitly by virtue of normal bitcoind
operation.  Adding an explicit check provides a stronger guarantee, and
it is cheap to add.
contrib/linearize: split block files based on year-month, not just year
Bypass reloading blocks from disk
Merge pull request #4649

b197bf3 [Qt] disable tray interactions when client model set to 0 (Philip Kaufmann)
314fbd9 [Qt] use BitcoinGUI::DEFAULT_WALLET constant in bitcoin.cpp (Philip Kaufmann)
8ca6a16 [Qt] ensure all class attributes are init to 0 (Philip Kaufmann)
Merge pull request #4673

1c5f0af [Qt] Add column Watch-only to transactions list (Cozz Lovan)
939ed97 Add boolean HaveWatchonly and signal NotifyWatchonlyChanged (Cozz Lovan)
qt: Add null check in setClientModel(0)

Don't clear tray icon menu if it was never created.
Necessary precaution after #4649.