Version 20131118.2 - 18/Nov/2013
  - Moved makeinstlog.sh in libexec path. Now slackpkg update also update
  install.log
  /usr/libexec/slackpkg/makeinstlog.sh -t
_try_ do detect the repository from which the package was installed
Added WGETOPTS
you can put it in slackpkgplus.conf or override from command line
WGETOPTS="--timeout=5" slackpkg update