Core
 - Release v1.2.16.1
Use Case Manager API
 - ucm: move optional file trace into uc_mgr_config_load_into
 - ucm: pass optional flag to config load functions to suppress spurious errors
Configuration
 - conf: add missing return value check in parse_def()

Signed-off-by: Jaroslav Kysela <perex@perex.cz>