allow to change the append and compress argument of vtk_grid in writeVTK

[chmerdon]

see https://juliavtk.github.io/WriteVTK.jl/dev/grids/syntax/ for the purpose of append and compress and Issue JuliaVTK/WriteVTK.jl#136 where these somehow lead to corrupted files that cannot be opened with some paraview versions on some architectures (I have this case on my machine).

By putting the defaults of append and compress to false this issues can be avoided it seems.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.77%. Comparing base (06a2f11) to head (807f9d4).
Report is 72 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #56      +/-   ##
==========================================
+ Coverage   73.01%   73.77%   +0.76%     
==========================================
  Files          27       32       +5     
  Lines        4239     4881     +642     
==========================================
+ Hits         3095     3601     +506     
- Misses       1144     1280     +136     

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