Fix issue 399 - Remove processing of linear geometries for speedup

[jfussbro]

Describe your changes here:

Before this PR all geometries were linked to occ geometries (when using curved option) even if they are linear.
This PR skips linear geometries when linking to occ geometries, resulting in a slightly better performance. There is now the posibility to use curved meshes in the time_forest_partition script.

Closes #399

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[sandro-elsweijer]

I have one last request and then we can merge

[sandro-elsweijer]

I am afraid the reformatting deleted all the changes you made @jfussbro. So the skipping of linear geometries is completely missing now.