unicornscan compatible output for tcp scans

forgot to add out-unicornscan.c

use '-oU' or '--output-format unicornscan'

Only supported for TCP SYN scanning. Other scans
will fall back to grep style output since unicornscan
has no support for non-TCP scanning.

use '-oU' or '--output-format unicornscan'

Only supported for TCP SYN scanning. Other scans
will fall back to grep style output since unicornscan
has no support for non-TCP scanning.

fixed bug where --echo didn't set ping = true for --ping scans

changed --echo to exit(0) instead of exit(1)

thanks to @jstnkndy for pointing out I didn't have this option documented

Slight Packaging rework

 * Rebuilt from current git
 * Moved to proper git versioned hash

Included more information about how banner checking requires a separate IP address or firewalled ports.