more unit tests for linop_matrix
more unit tests for linop_matrix

Takishima/bart,sdimoudi/bart,sdimoudi/bart,sdimoudi/bart,sdimoudi/bart,Takishima/bart,sdimoudi/bart,mrirecon/bart,mrirecon/bart,mrirecon/bart,sidward/bart,Takishima/bart,Takishima/bart,mrirecon/bart,sidward/bart,Takishima/bart,sidward/bart,sidward/bart,sidward/bart,mrirecon/bart