d/: restore debian dir

The debian dir was flushed in the merge.
I think git-import-orig thought it was part of the upstream sources.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
d/changelog: package 0.5.16

Let's the changelog know the 0.5.16 version.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>