Reorder local numbering for quad and hex

[jesusbonilla]

Quick fix for issue #3

[codecov-commenter]

Codecov Report

Merging #25 into master will increase coverage by 1.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   93.64%   94.78%   +1.13%     
==========================================
  Files           2        2              
  Lines         346      364      +18     
==========================================
+ Hits          324      345      +21     
+ Misses         22       19       -3     

Impacted Files	Coverage Δ
src/GmshDiscreteModels.jl	94.94% <100.00%> (+1.15%)	⬆️

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[AndiMD]

@jesusbonilla: Thanks for trying to solve this. I noticed however, that the .vtu export looks incorrect in Paraview:

[jesusbonilla]

Ok, I will take a look and see what is going on.

[AndiMD]

I was able to fix this by adding all ungrouped hex volumes into a group ("Solid_2"). I still have to save the .med file as .msh first, though.
Mesh_SimpleHex_AllGroups.med.zip

[fverdugo]

@jesusbonilla, after de discussion in #3 #25 do you think it is save for merge this? it is ready or you want to do more changes?

[jesusbonilla]

@fverdugo I think it is safe to merge this. However, I would not close #3 until we know what is wrong with some med meshes.