<!-- Output From `ipfs version --all`) --> go-ipfs version: 0.4.4-dev-b835b40 Repo version: 4 System version: amd64/darwin Golang version: go1.7 <!-- Bug, Feature, Enhancement, Etc --> Question <!-- from `P0` "Critical" to `P5` "Relatively Unimportant") --> P0 #### Description: How to control the hard disk space used by IPFS?