Remove all deprecated rank filter functions
Remove removing deprecated rank functions in to-do
Remove deprecated parameter in LineProfile
Remove another finished line from todo
Change default mode cascade in random_walker seg
Remove deprecated depth parameter in random_walker

This has been supplanted by the `spacing` parameter.
Remove `depth` from random_walker tests
Remove deprecated bullet point about deprecations
Remove deprecated function from applications
Fix `plot_segmentations` example text for SLIC
Merge pull request #978 from jni/more-deprecations

More deprecation removals