Revert "projectile: convert offsetIM to EqModel"
Revert "projectile: convert offsetIM to EqModel"

This reverts commit 377a943fdec6ec4c40aa46caa28b4570bfbd6401.

JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software,JacquesCarette/literate-scientific-software