New ports science/dlib-cpp and science/py-dlib (Python bindings for the former)

Changed from the reviewed form:

• fixed typo's
• added support for suffixed Boost::Python
• removed commented-out lines from patch

Submitted by: arrowsvc (6yearold@gmail.com, new maintainer)
Reviewed by: tcberner, adridg
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D14798