Set and return a mode of management of make function results more precise

To process this page used the WaterSteamPro function "wspSETTOLERANCEMODE": set and return a mode of management of make function results more precise as function of mode mode.

Function adjust the mode of functions result improvement. It is used when result of a function can be improved (functions with arguments (p, h), (p, s) and so on). Usually iterations used to do it. If an argument equals to zero improvement is disabled and calculation speeds up while the tolerance decreases.

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