Write displacement for TLSPH systems

[LasNikas]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.42%. Comparing base (785ade6) to head (84b01aa).

Files with missing lines	Patch %	Lines
src/io/write_vtk.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #840      +/-   ##
==========================================
- Coverage   70.43%   70.42%   -0.02%     
==========================================
  Files         106      106              
  Lines        6867     6868       +1     
==========================================
  Hits         4837     4837              
- Misses       2030     2031       +1     

Flag	Coverage Δ
unit	70.42% <0.00%> (-0.02%)	⬇️

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