Prune provably-unspendable outputs
[raw] reject insanely high fees by default in sendrawtransaction

There have been several incidents where mainnet experimentation with
 raw transactions  resulted in insane fees.  This is hard to prevent
 in the raw transaction api because the inputs may not be known.
 Since sending doesn't work if the inputs aren't known, we can catch
 it there.

This rejects fees > than 10000 * nMinRelayTxFee or 1 BTC with the
 defaults and can be overridden with a bool at the rpc.
Don't warn about forks while fIsInitialDownload
Add protobuf 2.5.0 download to gitian release process
Qt 4.8.3 r2 in gitian and release process

Also needed to add `unzip` package for the added unzip command for
OpenSSL in the Qt build.
configure.ac: remove superfluous bracket

Reported-by: Cory Fields
Merge pull request #2977 from laanwj/2013_09_release_process_protobuf

Add protobuf 2.5.0 download to gitian release process
Merge pull request #2968 from TheBlueMatt/master

Don't warn about forks while fIsInitialDownload
Longer term workaround for chainstate corruption from negative versions.

This also makes negative transaction versions non-standard.

This avoids an issue triggered in block 256818 where transactions with
negative version numbers were incorrectly serialized into the UTXO set.

On restart nodes detect the inconsistency and refuse to start so long as
a block with these transactions is inside the self-consistency check
window, logging "coin database inconsistencies found". The software
recommends reindexing, but reindexing does not correct the problem.

This should be fixed by changing the chainstate serialization, but
working around it seems harmless for now because the version is not
used by any network rule currently.

A patch free workaround is to start with -checklevel=2 which skips
the consistency checks, but the IsStandard change is important for
miners in order to protect unpatched nodes.
fix some cosmetic glitches in the codebase

- rename URL into URI in paymentserver where correct
- add some missing Qt-coding-stuff in paymentserver
- change QSpinBox to QLineEdit as base for BitcoinAmountField in .ui files
  (as this is the result when converting the BAF back into base)
- remove some c_str() and replace with QString::fromStdString()
- remove several new-lines
- remove unneeded spaces
- indentation fixes
Merge pull request #2961 from Diapolo/cosmetic

fix some cosmetic glitches in the codebase
autotools: use an absolute path to test data
configure: Check common include subdirectories for bdb headers, and refuse to use any version other than 4.8 by default
build-unix.md: Remove now-redundant and unnecessary Gentoo instructions
configure: Prefer specific known-good versions of Qt metacompiler tools
Bugfix: Since test_bitcoin is being built and run inside src/test/, try using relative directories from that point
Merge pull request #2982 from gmaxwell/20130908_ccoins_corrupt

Longer term workaround for chainstate corruption from negative versions.
Merge pull request #2979 from luke-jr/autoconf

Autoconf fixes
Move Parse{Hash|Hex} to be usable by all RPC code
Add RPC call decodescript