Updated the way we converge towards the smoothing length. We now use a Newton-Raphson scheme. This applies to the Gadget-2 scheme.

Added pressure to entropy and pressure to internal energy functions to the equation of state definition.

Include @bvandenbroucke's typo corrections in dimension.h as well as the sphere to radius calculation functions.

Wrote first working version of 1D moving mesh code. Got stuck in mesh steering and correct slope limiting.

Wrote dimension dependent matrix inversion method and corresponding unit test. Started making Gizmo dimension independent.