Lin2lm.m

Converts linear indexing state specification to L,M indexing. In the linear indexing convention, the states are listed in the order of increasing L rank, and, within ranks, in the order of decreas- ing M projection. Syntax: [L,M]=lin2lm(I)

WARNING - zero base indexing, that is:

                          I=0 -> (L=0,M=0)
                          I=1 -> (L=1,M=1)
                          I=2 -> (L=1,M=0), et cetera...

Arrays of any dimension are accepted as arguments.