fix: Octave can have 0 x m and n x 0 empty matrices: fix isempty
Slice access to arrays
rccross need not have unique r,c, add a test, comments and error checking elsewhere
fix for linear index of vector
subsasgn: A(logical) = B case

still more slicing todo
array test updated for slices

sliced assign still failing, not implemented yet
slice assignment, most of 2D wokring, probably 1D broken, WIP
2D growth in asgn
note on matching shape for A(slice,slice) = B

strangely almost anything is ok for 1D: A(slide) = {2d array}, even if A is a row vector
Fix for 1D assignment slices
fix slice bug (expansion of scalars) and add tests
2d logical indexing bug: test case for now, fix later
add comment noting possible improvement
fix warning in test