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Remove CHUD option since this is no longer provided in OS X.
Add a few comments to CMakeLists.

Also removed first configure variables.

Restructure energy filter to support CFS

This MR:

- Restructures the energy filter into an abstract class so that only specific solvers are supported (i.e. those that support the concept of kinetic energy/enstrophy)
- Adds implementations for the incompressible and compressible solvers
- Adds appropriate documentation and tidies existing filter documentation
- Removes uses of `\checkmark` in the docs in deference to `\cmark` which is already used elsewhere and has a corresponding `\xmark`.

See merge request !388

Fix/field convert interppoints

See merge request !387

Various fixes for Windows 7

This MR fixes a bunch of stuff for Windows 7 with Visual Studio 2013.

See merge request !391

Add various fixes to support OS X MacPorts portfile

See merge request !377

Fix/homog

Modal energy for CFS.

See merge request !389

Improve filter output, fix filter documentation, remove unnecessary use of \checkmark in deference to \cmark

Fix/tests cray mpi

Make the tests run and pass on Archer (and hopefully other Cray machines). Mostly changes to do with CMake - please see the commit message or ticket #154

See merge request !386

Fix/unsteady advection diffusion svv

See merge request !385