[skip ci]

The actual release process quite diverged from what was written here,
also clarify things a bit.

... in preparation for 0.13

Adds 127.0.0.1:9050 for the .onion proxy if we can succesfully connect
to the control port.

Natural followup to creating hidden services automatically.

- OSX —> OS X
- XCode —> Xcode
- github —> GitHub
- homebrew —> Homebrew
- gitian —> Gitian
- Other miscellaneous obvious spelling fixes and whitespace removal

Mention now allowed sequence of pushdatas in OP_RETURN outputs in
release notes.

Signed-off-by: Johnathan Corgan <johnathan@corganlabs.com>

Assume that when a wallet transaction has a valid block hash and transaction position
in it, the transaction is actually there. We're already trusting wallet data in a
much more fundamental way anyway.

To prevent backward compatibility issues, a new record is used for storing the
block locator in the wallet. Old wallets will see a wallet file synchronized up
to the genesis block, and rescan automatically.

It's unclear if people are using this and if it's worth maintaining.

These changes decode valid SIGHASH types on signatures in assembly (asm) representations of scriptSig scripts.
This squashed commit incorporates substantial helpful feedback from jtimon, laanwj, and sipa.

Add a section "low level RPC API changes" so that the changes with
regard to error codes can be added later.

... in preparation for 0.12

Add information about further notable changes:

- Big endian support
- Memory usage optimization
- Disable wallet transaction broadcast
- Stream isolation for Tor