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Fix FillWhiteNoise

This MR fixes a bug in `Vmath::FillWhiteNoise` which causes it to alternate between only 2 values.

Instead of trying to pass a unique seed on each call of FillWhiteNoise, I decided to partly recover an old implementation where `seed` was an static variable ( therefore making consecutive calls part of a single larger random sequence). From what I understood, this had been changed to allow specifying different seeds for each MPI process. With this in mind, we can still pass an optional seed to replace the stored value.

An example of how to use this new logic is to use (the negative of) the rank as seed in the first call to FillWhiteNoise to decouple the parallel processes, and not passing any seed in the subsequent calls . Alternatively, we can still pass unique seeds on each call.

See merge request !718

# Conflicts:
#   CHANGELOG.md

feature/mesh-spacing

The applies changes ask for my spencer after the madrid tutorial, BL resolution and variable names etc.
It also fixes the inverted boundary layer problem.
Finally, allows the variational module to be compiled without meshgen.

See merge request !736

Fix half mode in FieldConvert

This fixes a small bug which prevents FieldConvert from working with half mode expansions.

See merge request !734

Fix/iterative rhs magnitude

This MR fixes a bug in the calculation of the RHS vector magnitude used to scale the tolerance calculation, which resulted in an artificially higher tolerance being used.

Also fixes a bug in the verbose iteration count output of the CG algorithm when no iterations are performed.

See merge request !721

Conflicts:
	CHANGELOG.md

added documentation for the chk file backup

See merge request !727

Add hybrid performance model.

This MR adds a performance model for hybrid 2.5D simulations using the incompressible Navier-Stokes solver.

See merge request !724