New port: sysutils/safecopy

Safecopy is a data recovery tool which tries to extract as much
data as possible from a problematic (i.e. damaged sectors) source -
like floppy drives, hard disk partitions, CDs, tape devices etc, ...
, where other tools like dd would fail due to I/O errors. Safecopy
includes a low level IO layer to read CDROM disks in raw mode, and
issue device resets and other helpful low level operations on a
number of other device classes. The project also includes a device
simulator which can be used to simulate bad media for testing and
benchmarking safecopy as well as other data rescue tools.

WWW: http://safecopy.sourceforge.net/

PR: 216892
Submitted by: anastasios@mageirias.com
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D9479