faster saturation_temperature.

[longemen3000]

This PR is similar to the one on saturation_pressure. with a non allocating saturation pressure, we can use one step of that to greatly improve the initial point at a relatively low cost. the refinement step was changed from linear (T = T0 + k*(p - p0) to log-inv (1/T = 1/T0 + m*(log(p/p0), where m = -p0/((dp_sat/dT_sat)*T0*T0), dp_sat/dT_sat = (sl - sv)/(vl - vv)

To accompany the changes in saturation temperature, bubble_temperature and dew_temperature were modified to skip the critical point calculation if not necessary, For values over the critical point, we now use critical point extrapolation, extending the saturation slope until p or T matches (m = -pc/((dp/dT)*Tc*Tc) evaluated at the critical point). we solve the extended antoine relation until finding a suitable T0. because we are now using local info instead of an universal antoine coefficient, the initial values of temperature are closer than the ones recommended by the old alg.

[codecov]

Codecov Report

Attention: 43 lines in your changes are missing coverage. Please review.

Comparison is base (9161750) 79.70% compared to head (af87c95) 79.87%.

Files	Patch %	Lines
src/methods/initial_guess.jl	83.33%	14 Missing ⚠️
...y_solvers/singlecomponent/saturation/AntoineSat.jl	67.74%	10 Missing ⚠️
...ds/property_solvers/multicomponent/bubble_point.jl	87.69%	8 Missing ⚠️
src/models/cubic/equations.jl	0.00%	3 Missing ⚠️
...solvers/singlecomponent/saturation/ClapeyronSat.jl	80.00%	2 Missing ⚠️
..._solvers/singlecomponent/saturation/IsoFugacity.jl	60.00%	2 Missing ⚠️
...thods/property_solvers/multicomponent/dew_point.jl	95.45%	1 Missing ⚠️
src/models/cubic/PR/PR.jl	66.66%	1 Missing ⚠️
src/models/cubic/RK/RK.jl	50.00%	1 Missing ⚠️
src/models/cubic/vdW/vdW.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
+ Coverage   79.70%   79.87%   +0.16%     
==========================================
  Files         279      279              
  Lines       19532    19508      -24     
==========================================
+ Hits        15568    15582      +14     
+ Misses       3964     3926      -38     

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