Enhance Mesh.disconnect(points_per_cell=None, calc_points=True)

[adtzlr]

This includes:

• Make the re-evaluation of point coordinates optional
• Specify (trim) the number of points per cell (for Taylor-Hood Displacement-Pressure element formulations)

...and the following code-block will be possible:

# create a hexahedron-region on a cube
region = fem.RegionTriQuadraticHexahedron(mesh)

# add a mixed field container (with displacement, pressure and volume ratio)
mesh_dual = mesh.disconnect(points_per_cell=8, calc_points=False)
field = fem.FieldsMixed(region, n=3, mesh=mesh_dual)

closes #402

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (caff7f4) 97.41% compared to head (7585325) 97.41%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
=======================================
  Coverage   97.41%   97.41%           
=======================================
  Files          81       81           
  Lines        3633     3640    +7     
=======================================
+ Hits         3539     3546    +7     
  Misses         94       94           

Impacted Files	Coverage Δ
src/felupe/mesh/_mesh.py	100.00% <100.00%> (ø)

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