Updated Shopp Debug Log to override auto-update

Added a check for `?refresh=off` in the URL string which disables
auto-refresh
min-height property not working in Firefox

So I added a height property... Otherwise the log window was ~120px
high.
Shopp Debug Log update

This code creates less "undefined index" errors in the log.
Merge pull request #2528 from crunnells/master

A couple of UI changes