Update ground motions to support epistemic uncertainty

• Replace current: ScalarGroundMotion --> DefaultScalarGroundMotion --> MultiScalarGroundMotion with GroundMotion and factory class GroundMotions
• GroundMotions class to include methods for collapsing GroundMotion logic trees
• Refactor GMMs to return LogicTree<GroundMotion>; many models are singletons
• Build USGS uncertainty model into NGA-West2 with custom *_USGS flavors; *_BASIN models will implicitly include epistemic uncertainty model; remove UncertaintyModel
• Remove epistemic-model and epistemic-tree from gmm-config
• Remove gmmUncertainty flag from calc config
• Convert other GMMs that return MultiScalarGroundMotion (e.g. NGA-East) to build GroundMotion logic tree
• Propagate changes to ground motion classes into calculations and transforms
• Remove GmmProcessor

mentioned in issue #12 (closed)

changed the description

added GMM label

changed title from Refactor ScalarGroundMotion hierarchy to Update ground motions to support epistemic uncertainty

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mentioned in issue #129 (closed)

changed milestone to %Coding 'til Christmas

marked the checklist item Replace current: ScalarGroundMotion --> DefaultScalarGroundMotion --> MultiScalarGroundMotion as completed

marked the checklist item GroundMotions class to include methods for collapsing GroundMotion logic trees as completed

changed the description

marked the checklist item Refactor GMMs to return LogicTree<GroundMotion>; many models are singletons as completed

marked the checklist item Build USGS uncertainty model into NGA-West2 with custom *_USGS flavors; *_BASIN models will implicitly include epistemic uncertainty model; remove UncertaintyModel as completed

marked the checklist item Remove epistemic-model and epistemic-tree from gmm-config as completed

marked the checklist item Remove gmmUncertainty flag from calc config as completed

marked the checklist item Convert other GMMs that return MultiScalarGroundMotion (e.g. NGA-East) to build GroundMotion logic tree as completed

changed the description

marked the checklist item Propagate changes to ground motion classes into calculations and transforms as completed

marked the checklist item Remove GmmProcessor as completed

mentioned in merge request !215 (merged)

mentioned in commit 437c07ca

closed with merge request !215 (merged)

added 2023 label