This commit adds version information to btcctl. The plan is to keep
it in lock step with the btcd version. It also updates the release script
so the version file is updated automatically with the btcd one.
This commit improves the configuration for btcctl in several ways:
- Add the ability to specify a config file
- Add a default entry to the rpc cert to point to the location
it will likely be in the btcd home directory
- Move the config bits into a separate file for easier maintenance
