selectRunning() refinements

[jack-davison]

This PR refines selectRunning(). Unlike other similar PRs, this is a complete re-write to take advantage of modern toolings in {dplyr}.

• Use dplyr::consecutive_id() for simplicity & flexibility. This is a huge chang

• Adds three new args:

  • type & ... (I see this as being mostly useful for type = "site" or similar)
  • name (change column name that gets appended)
  • mode (allows function to filter rather than append a new flag column)

• Documentation refinements.

• Add tests.