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Completed: Export multi-Block Structured mesh into CGNS format

Senthan Swaminathan requested to merge write_cgns_structured into master

Multi-Block structured mesh created in Gmsh can be exported into CGNS format with this. (Note: this changes does not check the Un-Structured part of the mesh)

Main changes between the master and this branch are

  1. An option is included in Geo/CGNSOptions.h The Entry is bool structuredMesh; // = 1 if structured mesh, = 0 if un-structured mesh, default = 0

  2. The above entry is incorporated in GUI option window - Corresponding code change made in file Fltk/fileDialogs.cpp

  3. Few subroutines and the actual code that write structured mesh in CGNS format is included in file Geo/GModelIO_CGNS.cpp

'ctest' was run - All tests Passed

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