Prepare 3.1.4 release notes

Signed-off-by: Ralph Boehme <rb@sernet.de>
Bump version to 3.1.4

Signed-off-by: Ralph Boehme <rb@sernet.de>
Fixes for make distcheck

Signed-off-by: Ralph Boehme <rb@sernet.de>
Update manpages

Signed-off-by: Ralph Boehme <rb@sernet.de>
Add ABI file for 3.1.4

Signed-off-by: Ralph Boehme <rb@sernet.de>