periodic mesh output

Common/GmshMessage.cpp

Geo/GEntity.cpp

Geo/GEntity.h

Geo/GModelIO_GEO.cpp

Geo/GModelIO_MSH.cpp

Geo/GModelIO_MSH2.cpp

Geo/Geo.cpp

Geo/Geo.h

Geo/OCCEdge.cpp

Geo/SPoint2.h

Geo/gmshEdge.cpp

Geo/gmshFace.cpp

Mesh/BDS.cpp

Mesh/Generator.cpp

Mesh/meshGEdge.cpp

Mesh/meshGFace.cpp

Mesh/meshGFaceDelaunayInsertion.cpp

Mesh/meshGFaceDelaunayInsertion.h

Mesh/meshGFaceOptimize.cpp

Mesh/meshGFaceOptimize.h