Misc Improvements

[longemen3000]

• adds ReidIdeal model of R1234ze(E) (Adding fluid R1234ze(E) - ReidIdeal #292)
• Refactors critical extrapolation methods into functions: new functions: critical_psat_extrapolation, critical_tsat_extrapolation and critical_vsat_extrapolation (not exported). It also adds a CritExtrapolationSaturation saturation method that uses those extrapolations to give an (accurate enough) saturation results for points near the critical point.
• improves some superancillary initial points to use extrapolation in case the superanc is outside the domain
• renamed some internal functions for bubbledew saturation into extended_saturation_pressure and extended_saturation_temperature. as their name implies, they are equivalent to their normal names, but extrapolate beyond the critical point (via the extrapolation functions mentioned before)
• improved initial point for cubics (mentioned in dew temperature abnormality with water?  #290)
• adds some functions used in isochoric thermodynamic formulation: one key result is that: Ψ(model,T,ρᵢ) = sum(ρᵢ)*R*T*a_eos(model,1.0,T,ρᵢ). this allows to evaluate Ψ-related functions without extra allocations, and we can switch between isochoric and VTn formulations easily.

[codecov]

Codecov Report

Attention: Patch coverage is 34.22819% with 196 lines in your changes missing coverage. Please review.

Project coverage is 77.37%. Comparing base (640f7f8) to head (45cf149).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
src/methods/isochoric.jl	0.00%	74 Missing ⚠️
src/methods/initial_guess.jl	26.66%	33 Missing ⚠️
...ds/property_solvers/multicomponent/bubble_point.jl	55.55%	28 Missing ⚠️
...rs/singlecomponent/saturation/CritExtrapolation.jl	0.00%	22 Missing ⚠️
ext/ClapeyronSuperancillaries.jl	5.55%	17 Missing ⚠️
src/base/errors.jl	37.50%	5 Missing ⚠️
...thods/property_solvers/multicomponent/dew_point.jl	61.53%	5 Missing ⚠️
..._solvers/singlecomponent/saturation/IsoFugacity.jl	80.00%	3 Missing ⚠️
src/methods/stability.jl	0.00%	3 Missing ⚠️
src/utils/misc.jl	25.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #293      +/-   ##
==========================================
- Coverage   77.88%   77.37%   -0.52%     
==========================================
  Files         317      319       +2     
  Lines       23638    23847     +209     
==========================================
+ Hits        18411    18452      +41     
- Misses       5227     5395     +168     

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