Add ability to specify LINE_COORD_CODE for line devices

[johodges]

Is your feature request related to a problem? Please describe. I am working on adding contour plotting functionality to the python version of dataplot. FDS does not currently output the full xyz coordinate location of each point in a line device (only outputs the axis which is varying). Dataplot needs this information to build the meshgrid of points for comparison.

Describe the solution you'd like Add a new DEVC namelist input LINE_COORD_CODE which will overwrite the auto generation of this variable in read.f90 (~line 13460). This would allow the user to set the value to 123 to request all 3 coordinate outputs. It looks like DUMP already supports this LINE_COORD_CODE.

Describe alternatives you've considered We could hard-code a naming convention in dataplot to grab this information from headers, or parse the FDS file to grab this information. That does not seem like as good a solution to me.

Additional context I can add the functionality if the team is ok with this addition.