Add libvo-aacenc-dev depext for voaacenc.
Add xapi toolstack and a set of dependent libraries and services

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
xapi-tapctl: fix the uninstall target

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update xapi to 1.9.55, with a (hopefully fixed) configure script

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update xapi to 1.9.56

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
piqi 0.6.0 and 0.6.5 fail on 4.02.0 with a camlp4 error
message-switch: fix typo in opam file

Related to #2700

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #2706 from djs55/fix-message-switch

message-switch: fix typo in opam file
Merge pull request #2707 from camlspotter/for-pull-request

added meta_conv.1.1.5
Merge pull request #2700 from djs55/add-xapi

Add xapi toolstack and a set of dependent libraries and services
ojquery.0.1 not compatible with jsoo >= 2.4 

due to https://github.com/ocsigen/js_of_ocaml/commit/36dc6d2593530fcd7a4157743b09b2c722225df3
Sync latest compiler pull requests
Merge pull request #2709 from bactrian/sync-prs-1410908401

Sync OCaml compiler PRs
new package version why3 0.85
Merge pull request #2708 from hhugo/patch-1

ojquery.0.1 not compatible with jsoo >= 2.4
Merge pull request #2705 from planar/piqi-camlp4

piqi 0.6.0 and 0.6.5 fail on 4.02.0 with a camlp4 error
Merge pull request #2643 from yallop/voaacenc-depexts

Add libvo-aacenc-dev depext for voaacenc.
ocamlfind: minor release 1.5.3
archimedes needs camlp4
erm_xmpp needs camlp4