Bump version numbers for 0.8 release

Version numbers changed from 0.7.99 to 0.8.0
Set CLIENT_VERSION_IS_RELEASE to remove pre-release warning
Updated copyright in COPYING and doc/READMEs to 2013
Updated doc/release-notes.txt
Bugfix: Enable ConnectBestBlock to properly report back validation problems, and ensure orphan processing (when their parents are found) cannot be used to counter-DDoS the node providing the parent

Also fix a minor typo
Make sure the genesis block is present after reindex
Signrawtransaction shouldn't require redeemScript for non-p2sh txins.

The redeemScript functionality broke plain offline signing, this
change makes it only look for that parameter when signing a p2sh
input.
Merge pull request #2253 from luke-jr/bugfix_valstate

Bugfixes for CValidationState
Make transactions larger than 100K non-standard

Extremely large transactions with lots of inputs can cost the network
almost as much to process as they cost the sender in fees.

We would never create transactions larger than 100K big; this change
makes transactions larger than 100K non-standard, so they are not
relayed/mined by default. This is most important for miners that might
create blocks larger than 250K big, who could be vulnerable to a
make-your-blocks-so-expensive-to-verify-they-get-orphaned attack.
Merge pull request #2273 from gavinandresen/txsize

Make transactions larger than 100K non-standard
Merge branch 'reindexgen' of git://github.com/sipa/bitcoin
Do not call ResendWalletTransactions when reindexing, importing or on IBD

Calling ResendWalletTransactions when reindexing, importing or on IBD spams
other nodes with our old transactions, because they become unconfirmed.
Bugfix CValidationResult for BIP30 + add DoS
Merge pull request #2259 from Criptomonedas/dontresend

Do not call ResendWalletTransactions when reindexing or importing
Merge pull request #2264 from gmaxwell/signrawtransaction_for_regular_missing_txins

Signrawtransaction shouldn't require redeemScript for non-p2sh txins.
Merge pull request #2279 from sipa/cvrbip30

Bugfix CValidationResult for BIP30 + add DoS
Merge commit 'd38c6488d067c2e88726e2ca99bc76fd67dab49b'