Change method for specifying extra heat to HPWHsim

[spahrenk]

Description

-The data structure for handling extra heat was changed in HPWHsim. This changes the method by which cse-dhw_solar specifies the distribution of extra heat to HPWHsim. Previously, the values were specified in a std::vector of size 3 containing the bottom three of an implied twelve nodes. Now, the values are specified in a std::vector of size 4, where the first assigns power to the bottom 1/4 of the tank, with the rest zero.
-Note that the method for measuring the tank temperature has not been changed. Previously, both adding heat and measuring temperature referred to the same parameter hw_nQTXNodes.
-No cse tests are affected by these changes.

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[nealkruis]

This branch needs main merged in.

[nealkruis]

Merge main and update HPWHsim module to point to the latest "master" branch.