bart.m: don't use strjoin for compat. with old matlab
bart.m: don't use strjoin for compat. with old matlab

sidward/bart,Takishima/bart,Takishima/bart,nckz/bart,nckz/bart,grlee77/bart,sdimoudi/bart,mrirecon/bart,grlee77/bart,frankong/bart,frankong/bart,Takishima/bart,frankong/bart,sdimoudi/bart,sdimoudi/bart,mjacob75/bart,Takishima/bart,nckz/bart,mrirecon/bart,grlee77/bart,mrirecon/bart,sidward/bart,frankong/bart,sidward/bart,nckz/bart,mjacob75/bart,frankong/bart,grlee77/bart,mjacob75/bart,mrirecon/bart,mjacob75/bart,mrirecon/bart,sdimoudi/bart,nckz/bart,sdimoudi/bart,Takishima/bart,sidward/bart,grlee77/bart,sidward/bart,mjacob75/bart