Support SMAPIv3

• storage: add persistent to VBDs
• storage: vdi_info includes an optional uuid
• storage: support for RRD datasources

Add VDI.introduce

Merge pull request #81 from djs55/storage/vdi_introduce

storage: add VDI.introduce

VGPU changes

• Major updates to the VGPU interface
• Infrastructure to support Windows Update
• Updated documentation to reflect newer login_with_password API

Fix use of cohttp

Large messages were being accidentally truncated.

Improve memory interface

• Add query_reservation_of_domain API call to the memory interface

Floppy disks, IGD passthrough, read caching etc

• xen: add support for floppy disks (useful for packer, cloudinit)
• xen: add a VM call plugin mechanism for contacting future guest
  agents
• xen: add IGD passthrough
• storage: add o_direct and o_direct_reason for read caching
• add standard travis configuration

Better backtrace support

• storage: add a Backend_failure_with_backtrace exception
• xen: add a Task.backtrace field
• lib: use the new Backtrace package
• Add an opam file for easy pinning

Better block device naming

• Map all HVM device names to /dev/xvd*

Minor release

• allow the inventory path to be set via the 'inventory' configuration key

Added cmdliner support

• Add a cmdliner interface to Xcp_services with an example
• Add 'with sexp' to Vm.t
• Debug.DEBUG has an explicit module type