Log Message:
Update to 13c (as 0.9.13c). From the changelog:

- Bugs fixed: str_copy (wrong parenthesis setting)
- UI changed: log() -> log_who()
- Added: man str(3)
- Fixed wrong input boundary checking for multiple DNSCACHE variables
  settings in dns_rcip.c. (Tx. J.W.)
- Added missing str_copyb() function in str.c.
- DNS stub return codes straightend with djbdnscurve6-36.