Support a Tecplot-compatible output format

This is really low priority, but just to not forget about:

TecPlot360 is a proprietary but amazing visualization software which feels (in my hands) much better then Visit or ParaView. However, it does not (even) load the smalles common denominator VTK. Instead, a number of file formats are supported in-house:

• CGNS Loader
• DEM Loader
• DXF Loader
• EnSight Loader
• Excel Loader
• FEA Loader
• FLOW-3D Loader
• FLUENT Loader
• General Text Loader
• HDF Loader
• HDF5 Loader
• Kiva Loader
• PLOT3D Loader
• PLY Loader
• Tecplot-Format Loader
• Text Spreadsheet Loader

See also: http://home.ustc.edu.cn/~cbq/360_data_format_guide.pdf with meaningful pictures as this one:

Instead of Trentos code, we don't want to implement a writer which writes only the tecplot-specific format but instead use some of these widespread formats, for instance "FLUENT" or so.