make apply_along_axis public and have it return a projection
cleanup
more cleanup, but also note that the previous commit renamed
"apply_along_axis" to "apply_function", which is more accurate
fix test: unnecessary comma added
fix return type from _apply_numpy_function.   Now that I think about it,
that should probably be made public too
make apply_numpy_function public and have sum, min, max return
projections by default
Merge branch 'apply_publicly' into apply_everywhere
warn_slow for apply_functions