Rewrite pgr_nodeNetwork

• Internally building the SQL query
• Instead of checking all the little details:
  • Create a query based on the information
    • Do not check for indexes and/or creating indexes on edges and/or edges_noded
    • Not dropping the geometry column of edges_noded when the table exists
• Use the pgr_separateCrossing and pgr_separateTouching internally
• All existing pgtap tests should pass
• Add new pgtap tests based on the open issues