convergence of setSat functions very close to critical point

[thorade]

Very close to the critical point (e.g. T_crit-0.1 or T_crit-1e-6) the setSat functions may fail. This will happen only for fluids where only few data were available for fitting the EoS and the ancillary equations, one example is HDMS.

[thorade]

Tested convergence of setSat_T, setSat_p and setSat_d with 10000 points each,
tested HMDS, Ethanol, Isopentane, R134a, Propane, Butane, Helium.
All algorithms converged for all fluids, closing this issue.

[thorade]

With HDMS, Akasaka does find a solution, but it is a wrong one!
Check sat.liq.d, it is lower than critical density.

[thorade]

Close issues from commits: https://github.com/blog/831-issues-2-0-the-next-generation
List of allowed synonyms:

• fixes convergence of setSat functions very close to critical point #16
• fixed convergence of setSat functions very close to critical point #16
• fix convergence of setSat functions very close to critical point #16
• closes convergence of setSat functions very close to critical point #16
• close convergence of setSat functions very close to critical point #16
• closed convergence of setSat functions very close to critical point #16

[thorade]

new convergence ticket: #40