Merge pull request #3206 from rgrinberg/master

opium v0.11.0
bitstring: patch data bug with 4.02
ipaddr depends on type_conv

This was caused by https://github.com/ocaml/opam-repository/pull/3197
Merge pull request #3207 from camlunity/master

bitstring: patch data bug with 4.02
Merge pull request #3208 from samoht/master

ipaddr depends on type_conv
require at least ctypes-0.3.3
depend on type_conv for sexplib.syntax
Merge pull request #3210 from hannesm/update-ctypes-req

require at least ctypes-0.3.3
Add package Ketrew 0.0.0
Added back install files from 1.7.1 -- binary was not being installed.
Merge pull request #3211 from smondet/ketrew.0.0.0

Add package Ketrew 0.0.0
Merge pull request #3212 from johnwhitington/master

Added back install files from 1.7.1 -- binary was not being installed.