Fix FARGO to operate on angular instead of linear velocity
Simplify time constraint in FARGO. Second term is unnecessary since we do vertical averaging
Add maximum shear to physical properties
timestep_fluid now properly takes into account that cells can have different sizes and that the fastest velocity not necessarily means shortest timestep
Fix dt constraints that are printed to logs. Add shear constraint diagnostics for fargo
Remove unused variables and constants
Loop only within the bounds of physical domain in write_log
Merge pull request #43 from Xarthisius/fargo_fix

Fargo fix