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Updated with some small tweaks on a few variables due to this update. Since all other test seem to be passing and the changes were very small have updated the .tst file

Added some more regression test for non-trivial solution (Kovasnay flow) with convective outflow BCs and 2nd order time integration

Removed Boost_static_Assert calls which were leading to numerous warnings but was not checking anythign since dim is currently hard wired to be 3

Tidy compressible solver

This MR makes several changes which I believe make the code for the compressible solver a lot more organised. I originally intended to work on the efficiency of the solver, but I only made a few changes towards this. The main changes are:

- Move boundary conditions to separate class using factory

- Move functions for converting variables (e.g. GetPressure) to a separate auxiliary class

- Remove the ProblemType option and have RinglebFlow and IsentropicVortex as separate equation systems derived from Euler

- Try to be more consistent about what should  be in the CompressibleFlowSystem base class and what is specific to the particular equations

- Rewrite the GetFluxVector functions in a more compact form, which depends on the problem dimension only in the loop limits

- Allow passing Fwd and Bwd trace space to Advection and Diffusion operators as optional parameters. If these parameters are not set they are calculated as usual, but using them helps in saving some communication cost by reusing the values passed to the advection in the diffusion (perhaps a better condition is required to determine when to precompute these values).

I also implemented a semi-implicit DG/HDG for the unsteady advection diffusion, which seems to be working fine.

See merge request !684

Add support for binary output to Tecplot output

This MR adds support for binary Tecplot fields in the `.plt` format for both normal tensor/collapsed-coordinate output and equispaced output. In addition, when running in parallel, FieldConvert will now produce a single `.plt` instead of multiple file outputs per partition.

See merge request !683

Use new boundary functions in Extrapolate

This will address issue #13. Basically, this involves modifying `Extrapolate.cpp` to use the new functions from MultiRegions for working with boundaries, leading to a much simpler implementation.

See merge request !579

Add Nek5000 mesh and field conversion

This MR adds new modules for NekMesh and FieldConvert to support input from Nek5000 based format, which is a tensor-product GLL hexahedra and quadrilateral code. The mesh format is similar to the Nektar rea format but is sufficiently different to warrant its own input module. This MR also adds support for zlib-encoded input and output for NekMesh to reduce file size of test files.

There are some caveats:

- Field input is restricted to that written by Nek5000 in parallel - serial output is not supported.
- Mesh files only support very basic boundary conditions; walls and periodic conditions (there is no support for the `.usr` files that define time-dependent BCs). 

See merge request !680

Restart for filters based on FilterFieldConvert

This MR adds support to use a restart file for filters derived from FilterFieldConvert (e.g. averaged fields). 

See merge request !678

feature/meshelements makeorder

This merge cleans up a lot of the code in NekMeshUtils/MeshElements. 
It also improves the MakeOrder routines to include CAD entities in the logic.

This depends on MR !697 

See merge request !698

feature/foundations_SPI

Adds symmetric positive integration system to elements with one or more triangular face (not tensor expansion).
This is built onto of dave's work on the new nodalutils so will need to be merged and checked after that.

See merge request !696