Set bound_relax_factor to 0

[dallan-keylogic]

Fixes:

#1567

Summary/Motivation:

Frequently we get puzzling behavior, Pyomo warnings, or evaluation errors from IPOPT because, by default, it relaxes the variable bounds by a small amount. WaterTAP has successfully switched off this setting for several years without any major consequences.

Changes proposed in this PR:

• Adds a default configuration option of bound_relax_factor=0

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