Standardize ordering

[cvvergara]

Grouping functions by output:

• pgr_sloanOrdering
  • Does not need a template because it works only for undirected graph
• pgr_kingOrdering
  • Does not need a template because it works only for undirected graph
• pgr_cutchillMckeeOrdering
  • Does not need a template because it works only for undirected graph
• `pgr_topologicalSort
  • Does not need a template because it works only for directed graph
    `
    ordering_process to include all of those functions