Show more details for pending payments

[Sjors]

I have a payment that appears to be stuck, for more than 24 hours now:

lightning-cli listpays lnbc1… 
{
   "pays": [
      {
         "bolt11": "lnbc1...",
         "destination": "...",
         "payment_hash": "...",
         "status": "pending",
         "created_at": ...,
         "amount_msat": "...msat",
         "amount_sent_msat": "...msat"
      }
   ]
}

lightning-cli paystatus lnbc1… 
{
   "pay": []
}

Specifically it would be nice to see what the various possible timeout moments are.

Also, do I assume correctly that "pending" means the pre-image has been revealed to at least one hop on the channel, so it's not safe to pay again? It would be useful to clarify that in the listpays doc.

Seeing the entire route(s) would be nice too. Then I can dig around in Mempool to see if e.g. any of the intermediate nodes have been offline or seeing forced channel closes.