[cmake,release] Add support for AmiraMesh.
(cherry picked from commit 95c5b7cdbf7e9fecfdeeb6b29defc4e633ffe5df)

Signed-off-by: Markus Blatt <markus@dr-blatt.de>
[cmake,release] Minor documentation fix.
(cherry picked from commit f9d7684b89a598e007d160573924eafb366a9ef7)

Signed-off-by: Markus Blatt <markus@dr-blatt.de>