Improve file reconstruction in AdditiveFOAM function object outputs

[colemanjs]

Currently, the Allrun scripts concatenate files for function object outputs such as solidificationData. The header should be parsed from the file directly, rather than assuming some header structure, see

AdditiveFOAM/tutorials/AMB2018-02-B/Allrun

Line 49 in 3894f79

echo "x,y,z,tm,ts,cr" > ExaCA/time-temperature.csv