Import dirvish slackbuild from vbatts/SlackBuilds.
Update dirvish tarball md5sum.
Import perl-time-period from vbatts/Slackbuilds.
Import perl-time-parsedate from vbatts/SlackBuilds.
Update perl-time-parsedate to 2013.0912.
Add patches from debian.
Update build to current SBo templates.
Update bspwm SlackBuild to 0.8.8 plus git d7c81d8.