freecad: + update to 0.15.4671; + add gmail.com:mschamschula as comaintainer; + fix building with new Qt4 install location; + add code to create stub App; + add new dependencies on py27-matplotlib and py27-pyside-tools; + remove integrated patch; + allow building with any MacPorts gfortran; + tweak configure args for new release requirements; + addresses tickets https://trac.macports.org/ticket/48953, https://trac.macports.org/ticket/47760, https://trac.macports.org/ticket/46157, and https://trac.macports.org/ticket/47369.
