Merged compatible code from no-statistics branch.
Merge branch 'master' of github.com:jtobey/bitcoin-abe into master-test
Merge bitcointools upstream changes and update callers.
* delete-chain-transactions: new command.
* rewind-datadir: new command.
Add --no-load config option

no-load skips loading blocks into the database, which is useful for a
"read-only" instance meant for serving from a shared database.

This is useful when having a dedicated instance loading blocks using
the --no-serve option so that "webserver" instances never block.
Update DataStore.py
Merge pull request #30 from RaymanJr/Worldcoin

Update DataStore.py
Update copyright and contact info for team ownership.
Bug fix: KeyError: 'unlinked_count' in import_block.
Merge pull request #28 from dermoth/master

Add --no-load config option
Fix string index out of range doing catch_up

This fixes bitcoin-abe issue #34
Use <VirtualHost *:80> instead of <VirtualHost *>.
Fix SQLite RPC-mode: TypeError: 'NoneType' object has no attribute '__getitem__'
Support limited functionality without a database.
--query: new option.
Use --query rather than an external URL to find address_version.
Added to-do comments.
* Do not create datadir.datadir_loader.
* Minor refactoring to support chains as objects.
* Factor some chain-specific logic into Chain.py.
* Drop the policy and magic tables.
Replace chain_id with chain.id a few places.