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We dont use the partition info here because pts files should be
independant of any meshes/expansions. Instead, we use the file matching
the rank and in case n_ranks!=n_files, we load all pts files for all ranks.

Fix in LinSysDirectFull.  Added a Helmholtz test with Neumann BC only.

This fixes the DirectFull solver in the case where there are no Dirichlet BCs.

See merge request !655

Extra scalar fields in IncNS

This MR makes small changes to allow the solution of the advection-diffusion equation for passive scalar fields in the IncNavierStokesSolver.

See merge request !624

Extend ProcessCurve to allow reading coordinates from file

This MR extends the ProcessCurve module of NekMesh to read  the coordinates from a file (in 2D).

The file should be in the .pts format, with `DIM=1` and one field corresponding to the y-coordinate. For example:
``` xml
<?xml version="1.0" encoding="utf-8" ?>
<NEKTAR>
  <POINTS DIM="1" FIELDS="y" >
    0.000000E+00    0.000000E+00
    1.000000E+00    1.000000E+00
  </POINTS>
</NEKTAR>
```

See merge request !628

Conflicts:
	CHANGELOG.md

Avoid reading fld twice in FieldConvert

This MR introduces a small change to avoid loading the fld file twice in FieldConvert. Currently, InputXml imports just the FieldDef to set the expansion, and later InputFld reads the data. However, this is very inefficient, since the whole fld file has to be loaded even if we just want the FieldDef. This MR basically makes InputXml load both the fielddef and the data, and later InputFld just extracts the data.

See merge request !649

Suppress Xxt stats output when running without verbose option

This MR makes small changes to the Xxt solver to output the stats only when we are using the verbose option. Unfortunately, I think it is not possible to suppress the output from gs_setup, which is much more annoying.

See merge request !642

Fix missing package dependency for NekMesh utility.

The MR fixes a missing dependency on libnektar++-nekmeshutils in the nektar++-utilities package.

See merge request !650

Advance tutorials submodule for v4.3.2.

This MR just advances the submodule commit ID for the tutorials.

See merge request !643

Fix instances of MeshConvert in user guide.

This MR includes some minor fixes to the user guide.

See merge request !640