Draft: PCHPDDM: add PCHPDDMCreateDeflationMat()
Thanks-to: Tom Caruso
Funded-by: France 2030 NumPEx Exa-MA (ANR-22-EXNU-0002) project
Edited by Pierre Jolivet
Thanks-to: Tom Caruso
Funded-by: France 2030 NumPEx Exa-MA (ANR-22-EXNU-0002) project