1.5.3
backup-restore: ignore missing switchable-auth in backup
lib: fix coverity warnings
CONFLICT! lib: bump soname version to 6:0:2
cli: add is-feature-enabled
lib: update exports file with new API
lib: add pkgconfig file
lib: add new switchable-auth PAM stack
lib: fix typo in authselect_profile.c
lib: create donf database directory if it does not exist