cryotools/cosipy: COSIPY v1.4

Major runtime optimisation release:

• Optimisation of runtime by implementing numba
• Added SLSQP and Newton optimisation for finding surface temperature
• New ground heat flux calculation (does not depend on layer heights any more)
• Layer ice fraction added to the restart file
• Snow properties timestamp since last snowfall now to obtain correct albedo values after restart (before it was relative to selected start point) t
• Added minimum_snowfall to constants (minimum snowfall per timestep) and separate it from minimum_snow_layer_height (which is used within the adaptive regridding)
• Initial top temperature of snowpack depends on air temperature of first-time step now (before it was a constant)
• Change names of initial density constants
• Better constrained initial density and temperature profiles
• Heat equation has been vectorized (runtime optimisation)
• README and requirements.txt updated
• yaml log has been deleted