FreeCAD 0.18.4 release, the open source CAD / CAE tools

FreeCAD is based  OpenCASCADE  open-source CAD / CAE tools. 0.18.4 has been released , as follows:

• Repair of Slow GC QGIPrimPath
• Merge pull request
• [Spreadsheet] Excel file import error repair Py3
• Xrange fix errors in PathCircularHoleBaseGui.py
• Xrange fix errors in PathSurface.py
• Repair> Print Preview function = Qt 5.9
• Repair thumbnail FEM sample file
• Fixed 'pythonopen' problems