Restore sparse_encoding: it's still needed to unmarshal sparse_dd's debug output

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Remove left-over "<<<<" markers

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #1550 from djs55/remove-old-libs

Restore sparse_encoding: it's still needed to unmarshal sparse_dd's debu...