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 server into a global datastructure
that just sits there after being processed once -- reads bootstrap servers
one by one, processing them.
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 works now.
Has a simple README, with instructions for Debian-based distros.