CHANGES:
- Add explicit dependencies to the unix library (psafont, #79)
- Include changes present in the in xapi. (#78)
- Add Hybrid_raw_input (robhoes)
- Limit the size of sectors when coalescing (Vincent-lau)
- Speed up unit tests, make them more reliable (etorok, psafont)
- Replace some existing patterns with functions in newer compiler versions,
requires OCaml 4.10 (last-genius, contificate)
- Update usages of io-page and cstruct for compatibility with latest releases
(psafont #77)