l10n update
Remove build-time no-IPv6 setting

The year is 2014. All supported operating systems have IPv6 support,
most certainly at build time (this doesn't mean that IPv6 is configured,
of course).

If noone is exercising the functionality to disable it, that means it
doesn't get tested, and IMO it's better to get rid of it.

(it's also not used consistently in RPC/boost and Net code...)
Removed LevelDB changes

Syntax Highlighting
Better std exception logging for CAddrDb
Use correct Qt tools in Gitian Linux build
stop bitcoind/bitcoin-cli processes that might have been left running
reorder includes to compile on OpenBSD

From getifaddr(3) manual:
"If both <net/if.h> and <ifaddrs.h> are being
included, <net/if.h> must be included before <ifaddrs.h>"

http://www.openbsd.org/cgi-bin/man.cgi?query=getifaddrs&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html
Don't use ded -i to stay POSIX compliant
Remove reference to libboost with specific version
Create (MANDATORY|STANDARD)_SCRIPT_VERIFY_FLAGS constants
Let tx (in)valid tests use any SCRIPT_VERIFY flag

Previously only P2SH could be set.
add DEFAULT_TRANSACTION_FEE constant in wallet

- as this is a shared Core/GUI setting, this makes it easier to keep them
  in sync (also no new includes are needed)
rpc: add `getblockchaininfo` and `getnetworkinfo`

Adds two new info query commands that take over information from
hodge-podge `getinfo`.

Also some new information is added:
- `getblockchaininfo`
  - `chain`: (string) current chain (main, testnet3, regtest)
  - `verificationprogress: (numeric) estimated verification progress
  - `chainwork`
- `getnetworkinfo`
  - `localaddresses`: (array) local addresses, from mapLocalHost (fixes #1734)
Remove NumBlocksOfPeers

Generally useless information. Only updates on connect time, not after
that. Peers can easily lie and the median filter is not effective in
preventing that.

In the past it was used for progress display in the GUI but
`CheckPoints::guessVerificationProgress` provides a better way that is now used.
It was too easy to mislead it. Peers do lie about it in practice, see issue #4065.

From the RPC, `getpeerinfo` gives the peer raw values, which are more
useful.
l10n AGAIN
build: fix make clean on OSX

Rebased-From: 74df0f5
Rebased-By: Wladimir J. van der Laan <laanwj@gmail.com>
[Qt] fix Qt slot problem in receivecoinsdialog

- fixes error from debug.log:
  QMetaObject::connectSlotsByName: No matching signal for
  on_recentRequestsView_selectionChanged(QItemSelection,QItemSelection)
- small style fixes (e.g. alphabetical ordering if includes etc.)
- fixes #3992
ui: Check for !pixmap() before trying to export QR code

Adds null pointer checks as well as prevents the Save/Copy context
menu from appearing at all if no image is shown.

Fixes issue #4140
Add missing cs_main lock to VerifyDB

Fixes issue #4139.
typo