Support simultaneous RSYS and ideal hvac

[chipbarnaby]

Description

Allow both RSYS and ideal HVAC to serve a zone. This allows determination of energy required to hold zone setpoints when RSYS capacity is insufficient.

1. Eliminated input check that prevented specification of both RSYS and ideal in a zone.
2. Reorganized calc sequence so ideal hvac model follows possible RSYS use and is aware of RSYS impact.
3. Added @zone[].qsIdeal, @ZNRES[].qshIdeal, and @ZNRES[].qscIdeal

(more to come)

[nealkruis]

@chipbarnaby any other changes needed here before review?

[chipbarnaby]

Additional features such as efficiency and meter links are not done. Some documentation is probably needed. We could decide upon an intermediate stopping point and then merge.

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