eqberkovich

Add SCF dataset processing

1

Added code to download and process SCF data (from Fed).

Parameters to amend: policyengine_us\parameters\gov\usda\snap\income\deductions\utility\standard.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\electricity.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\gas_and_fuel.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\phone.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\sewage.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\trash.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\single\water.yaml policyengine_us\parameters\gov\usda\snap\income\deductions\utility\limited\allowance.yaml