(go_daemon): Now static.

Check param.anyone_can_create_new_persons and create_pers.

include all fields.  This wastes 8 bytes, but that way there is no
risk that the struct looks different in different files.

Test NDEBUG instead of DEBUG.

Use $(srcdir) for *.c and *.h.

Test NDEBUG instead of DEBUG.

Use configure to set NDEBUG, LOGACCESSES or NDEFENSIVE_CHECKS instead.

is written to the log file.

message to stderr, exit with exit status != 0, and count on cron to
deliver the message to whoever should get it.

Kill lyskomd if etc/status exists.
Use ldifftime(), not difftime().