Changes in version 1.28.0                        

    o   Added createClusterMST() to create a cluster-based MST from a
	variety of inputs, migrated from the scran package.

    o   Added reportEdges() to report edge coordinates for plotting.

    o   Added mapCellsToEdges() to map cells to the closest edge on the
	MST.

    o   Added orderCells() to compute a pseudotemporal ordering from
	mapped cells.

    o   Added quickPseudotime() to wrap MST construction and ordering
	into a single call.

    o   Added testPseudotime() to test for DE genes along one or more
	paths through a MST.

    o   Added the rowmean() utility to compute column means for row
	groupings.

    o   Added perCellEntropy() to compute per-cell entropies across
	various matrix types.