Qt: show mined transactions at depth 1

- before, we used to show them in GUI when depth >= 2, which could lead to
  confusion of users, as the RPC behaviour already showed the Tx
Qt: add copyrightLabel to aboutdialog.ui

- add a new label, which can be updated independently from the whole
  license information stuff
- the benefit is, we don't need to re-translate that whole wall of text
  every year the copyright info changes
- update to the same copyright string we use in the source and in the
  bitcoin-qt.exe meta-data information
- removes an obsolete entry from the ui-file
Removed duplicated lock

Around line 167 there is already a LOCK(bitdb.cs_db) that covers everything. Re-locking is useless.
I forgot to paint the bike shed
Remove unused styles on Windows from gitian qt build

Keeps the "windows", "windowsxp", "windowsvista" styles.

Reduces the size of a static bitcoin-qt.exe by ~400 kB.
make use of -onlynet more clear in release notes
remove I2P support mention from release notes
Merge pull request #1739 from freewil/onlynet-release-notes

make use of -onlynet more clear in release notes
Merge pull request #1741 from freewil/release-notes-remove-i2p

remove I2P support mention from release notes
Changed nprev->pprev

It should be pprev, because the next one is pnext, and it's printing the memory address of the CBlockIndex (so pSomething).
Refactor: move alert code from main to alert.cpp/h
Give testnet it's own alert key.
Small update to release notes regarding -seednode
Bugfix: increase score, not port
Merge pull request #1748 from sipa/bugfix_portinc

Bugfix: increase score, not port
Don't force IRC off if not listening, do force it off if IPv4 is off.

Previously Bitcoin would refuse to use IRC if it was either not
accepting inbound connections or not making outbound. Instead this
changes it to not use IRC only if it's not doing either or if
IPv4 is off completely. If Bitcoin is not listening this will use
the default random nicks rather than the IP based ones.
Don't retry a failing IRC nickname forever.

If our IRC nick is in use (because some other node thinks it has
the same address we think we have) don't fruitlessly try to reconnect
using that name forever. After three tries, give up and use a random
nick. Either we'll learn a new local address from IRC and switch
to that, or it was right and the other guy is advertising for us.

This avoids a pessimal case where a second testnet node behind
a nat is unable to get any peers because he can't get on IRC.
Update string for Show/Hide in the tray

- be clear we don't "Show/Hide Bitcoins", but just the client window
- remove the tooltip for toggleHideAction as this is not shown anyway
- update a comment to be more general
Remove json/*.cpp from Qt build system

They are unneeded as jsonspirit is always used as template library,
the other makefiles don't include them either.
Merge pull request #1751 from laanwj/2012_08_qtjsonspirit

Remove json/*.cpp from Qt build system