splitting of a list
[l1,l3]=explolist(l1,l2)
l1 = the list to split
l2 =the list of conditions
l1 = the initial list without the elements verifying the conditions
l3 = the initial list with the elements verifying the conditions
[grocer_lx,grocer_lnp]=explolist(grocer_lx,list('grocer_lx(i)==''noprint''')) // example taken from function ols.