Drop fees by 10x due to the persistently higher exchange rate.

The last fee drop was by 5x (from 50k satoshis to 10k satoshis)
in the 0.8.2 release which was about 6 months ago.

The current fee is (assuming a $500 exchange rate) about 5 dollar
cents. The new fee after this patch is 0.5 cents.

Miners who prefer the higher fees are obviously still able to
use the command line flags to override this setting. Miners who
choose to create smaller blocks will select the highest-fee paying
transactions anyway.

This would hopefully be the last manual adjustment ever required
before floating fees become normal.
Increase default -blockmaxsize/prioritysize to 750K/50K
Add rpc command 'getunconfirmedbalance' to obtain total unconfirmed balance

Conflicts:
	src/rpcserver.cpp
some string and indentation updates in init/rpcclient
cleanup includes in rpcnet.cpp
Fix infinite loop with LogPrint on Windows

Running -printtodebugger -debug (or -debug=lock),
compiled with -DDEBUG_LOCKORDER would infinite loop
on Windows because every critical section lock/unlock
triggers a LogPrint.

Solution is to use the raw boost mutex instead of a CCriticalSection.
Use thread-local storage for LogPrint(category...)

This prevents crashes at shutdown where a global destructor
calls LogPrint(category...) after mapMultiArgs has been
deleted.
Release process: add section about announcing new release
[Qt] add messages when handling local payment request files

- important for the open URI dialog to give users feedback
  when a file is invalid etc.
Merge pull request #3350

fdbdb7f cleanup includes in rpcnet.cpp (Philip Kaufmann)
b6aafca some string and indentation updates in init/rpcclient (Philip Kaufmann)
Add tests for correct and incorrect order of signatures for a multisig
(P2SH)
Update build-osx.md
Merge pull request #3389 from regergregregerrge/patch-1

Update build-osx.md
Merge pull request #3379

4f99b16 Release process: add section about announcing new release (Wladimir J. van der Laan)
[Qt] fix possibilty to delete last sendcoins entry

- hide the entry about to be deleted, and if it is the last entry add a
  new one, so that we always have one entry in our list
[Qt] fix RecentRequestsTableModel function ambiuguity

- fixes a compiler ambiguity error with ::createIndex() called in
  RecentRequestsTableModel::index()
- also add some Q_UNUSED() macros
Merge pull request #3382

24646ee [Qt] fix possibilty to delete last sendcoins entry (Philip Kaufmann)
build: fix syntax error on older m4/autoconf.

Fixes #3358. This affects preinstalled autotools on osx 10.6.
Use 'make check' instead of 'make test'
Merge pull request #3395 from ldenman/patch-2

Use 'make check' instead of 'make test'