MacPortsRequirement.py: Added MacPorts Requirement Manager
Added MacPortsRequirement.py, which manages packages from https://www.macports.org/
Added MacPortsRequirementTest.py
Closes #131 (closed)
Added MacPortsRequirement.py, which manages packages from https://www.macports.org/
Added MacPortsRequirementTest.py
Closes #131 (closed)