Missing getmempoolentry

[FrozenPrincess]

Here's a sample call:

getmempoolentry abed2bc7cc77a4bc342a67e29da974b9cc69d47afa6279463d916009b1bcb6a3

{
"size": 372,
"fee": 0.00008280,
"modifiedfee": 0.00008280,
"time": 1484977137,
"height": 1085243,
"startingpriority": 541889.8421052631,
"currentpriority": 568809.6710526316,
"descendantcount": 1,
"descendantsize": 372,
"descendantfees": 8280,
"ancestorcount": 1,
"ancestorsize": 372,
"ancestorfees": 8280,
"depends": [
]
}

In my particular use-case, the fields I need are `ancestorsize` and `ancestorfees` as I'm trying to compute the feerate to guestimate if it'll confirm. I notice these fields are also missing from btcjson.GetRawMempoolVerboseResult.  So it'd be nice if they were also made complete

[dajohi]

btcsuite/btcd#905

[davecgh]

@dajohi: For reference, even if you add those fields to the result as 905 currently does, none of the ancestor/descendant information is available to populate the results. The mempool doesn't current keep track of that information.

EDIT: To clarify that obviously would only apply to responses from btcd. Speaking to Core which does provide it would work.

[dajohi]

@FrozenPrincess Are you able to give #117 a try?