Remove --re-interval AWK argument from all filters.

Don't know from where this got in; it's not relevant here, and Hruby
Vladimir reported on the Todo.txt mailing list that his system doesn't
support it.
Dev: Enable :AutoAdapt of copyright dates etc. for my project.
browse: Limit to web resources (http:// et al.)

All other sorts of URLs are probably custom defined schemes that do not make sense to be launched through a web browser, but rather hand them to the operating system to launch them through the configured default application. For that, I'm cloning the original version of this action to a new "open" action.
Add open action, which is a clone of the browse action that handles non-web resources.
Add hamster action