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Better way of dealing with the chemistry i/o. The i/o routines directly call the list construction, lowering the burden on the hydro scheme mainteners.

This reverts commit 10f04895.

Removed time step from flux computation. Removed (untested) flux limiter and unused variables in hydro_part. Discovered and fixed a possible bug in Gizmo particle velocities treatment in flux computation.

Use the equation of state functions in a few more places in the gizmo code to be more robust to changes.

Partially restored old time step criterion. Isolated flux limiter into a separate file and made it configurable. Removed some superfluous gravity variables.

Implemented the changes in ls that prevent gizmo crashes in cases where the mesh is seriously distorted

Added some extra isothermal eos flags in Gizmo/hydro.h. Made sure gpart mass is updated when conserved mass changes. Fixed a number of possible issues with the isothermal Riemann solver.

Made a small but important change in computation of hydro acceleration. Added total energy to snapshots instead of thermal energy.

Broke one of my own rules by doing too much in a single commit: implemented runner_extra_ghost, moved gradient calculations for both gradient types to new gradient loop, fixed bug in engine.c involving the number of links (which is larger with an extra loop), streamlined gradient methods, documented most GIZMO specific files. Second loop works.

Added volume to Gizmo/hydro_io. Added volume unit conversion. Isolated gradients calculations in separate files.

Added GIZMO_SPH option in const.h. Made sure the resulting code compiles. It probably does not work correctly though.