buckets on disk

[UnixJunkie]

now this makes a lot of sense with the add method having been added (to grow an existing tree)

[UnixJunkie]

• we need to change the bucket type or use a Bucket module parameter
• we need to time the dist for 100 points

[UnixJunkie]

use dokeysto with camltc backend for that

[UnixJunkie]

before storing the bucket on disk, we should sort its points according to their dist to the vp