other endomorphic methods

[sa-lee]

Some gaps in the API that are covered by GenomicRanges are slidingWindows and tile, we could make the following: set_tiles set_windows

[lawremi]

Are these actually setting the new ranges on the input? I think those would produce new ranges. I think tile() is already a verb; we may not need to change it. slidingWindows() could become make_sliding_windows().

I was thinking yesterday that we may want a verb, if we do not already have it, that converts from a GRanges to a GPos, i.e., it expands ranges into position-wise elements. The original design document suggests compute_runs() for doing the opposite (GPos->GRanges). But for GRanges->GPos, what would be a good verb? expand_to_positions()? Maybe compute_runs() should instead be collapse_to_runs()?