Add initial version of the Backtrace module

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Add opam package definition

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #1 from djs55/initial-version

Add initial version