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Add the specification for a new migration stream format. The document includes all the details but to summarize: The existing (legacy) format is dependant on the word size of the toolstack. This prevents domains from migrating from hosts running 32-bit toolstacks to hosts running 64-bit toolstacks (and vice-versa). The legacy format lacks any version information making it difficult to extend in compatible way. The new format has a header (the image header) with version information, a domain header with basic information of the domain and a stream of records for the image data. The format will be used for future domain types (such as on ARM). The specification is pandoc format (an extended markdown format) and the documentation build system is extended to support pandoc format documents. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Ian Campbell <Ian.Campbell@citrix.com>