iocaml-kernel depends on older Ctypes due to Array->CArray change

See andrewray/iocaml#20
Add gdal 0.3.0 (ctypes update)
Try using a PPA rather than building from source
Fix gist URL
Merge pull request #2124 from hcarty/gdal-0.3.0

Add gdal 0.3.0 (ctypes update)
fix nanomsg (#2123)
Add lwt-zmq 2.0.0
Merge pull request #2126 from samoht/master

fix nanomsg (#2123)
Merge pull request #2125 from hcarty/zeromq-use-ppa

zeromq- Try using a PPA rather than building from source
iocaml-kernel: fix ctypes rev; via @samoht
fix ounit constraint for hamt
hamt: use macro make and not force use of gmake
mldonkey: add depext for zlib
Merge pull request #2127 from hcarty/lwt-zmq-2.0.0

Add lwt-zmq 2.0.0
Merge pull request #2118 from avsm/ctypes-rev-dep

iocaml-kernel depends on older Ctypes due to Array->CArray change
Merge pull request #2129 from avsm/master

mldonkey: add depext for zlib
hamt: ounit is not optional
add a package provinding a bytes module for ocaml < 4.02 and an empty package for ocaml >= 4.02
Merge pull request #2128 from avsm/ounit-hamt

Fix hamt compilation
+tgls.0.8.1

Partially fixes #2130.