use user HOME dir for cache, config, models#253

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EricDeveaud wants to merge 3 commits intoRosettaCommons:mainfrom

EricDeveaud:main

Commits on Jun 21, 2024

define and generate USER_DIR var, ie: HOME/rfdiffusion for cached files, config location and so on
EricDeveaud
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models, schedules cache dire located to HOME/rfdiffusion.
EricDeveaud
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hydra config searched under HOME/rfdissusion/config/inference
EricDeveaud
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