Improved DHT bootstrap daemon

- Supports "unlimited" number of bootstrap nodes in the config file, instead of just 32.
- PID and keys file paths are not limited by 512 chars anymore.
- Doesn't read the whole list of bootstrap servers into a global datastructure that just sits there after being processed once -- reads bootstrap servers one by one, processing them between reads.
- Supports IPv6.
- Has an option for IPv6.
- Supports LAN discovery.
- Has an option for LAN discovery.
- Writes to syslog.
- Uses new functions introduced in the core.
- `status` in the bash script now works.
- Has a simple README, with instructions for Debian-based distros.

Tested -- works just fine.