gotcha 5.x-1.x-dev updated

I have committed some updates to gotcha D5 development version

extended the gotcha admin settings to include:
configurable hidden form element.
configurable log age.
configurable log viewer.
removed the spam module dependency.
added cron to prune log.
removed html from emails.
code cleaned up with Code Review module.

I have had most of these changes running on a couple of production sites for some months, so far without problems.
feedback welcome.