Release 0.7.2 (experimental support for R13/R14)

[Manfred Moitzi]

Version 0.7.2 - 2016-03-05

• NEW: reads DXF R13/R14 and saves content as R2000 (AC1015) - experimental feature, because of the lack of test data
  
• NEW: added support for common DXF attribute line weight
  
• NEW: POLYLINE, POLYMESH - added properties is_closed, is_m_closed, is_n_closed
  
• BUGFIX: MeshData.optimize() - corrected wrong vertex optimization
  
• BUGFIX: can open DXF files without existing layout management table
  
• BUGFIX: restore module structure ezdxf.const
  

From this release on ezdxf should open any given DXF file (created by AutoCAD!).