Multiple file header in TecPlot files

[MuellerSeb]

Why is the header for TecPlot files for polyline-data written two times?
This is actually violating the TecPlot data format guide:
http://home.ustc.edu.cn/~cbq/360_data_format_guide.pdf

ogs5/FEM/Output.cpp

Line 1752 in e8ed76b

if (number == 0 || number == 1) // WW if(number==1)

[wenqing]

I think it was for an old version of Tecplot. We can change if it is necessary.