wrong default karma points for the regex filter in SpamFilter

[lalinsky@…]

The default regex_karma is -5 which is wrong I think, because with this setup matching a pattern from BadContent increases the karma, while logically it should decrease it.

[anonymous]

And a more general comment, the karma points configuration is a little bit confusing. For example the session filter strategy adds the karma points to the final karma, but other filter strategies substract the karma points from the final karma. I think it would be better to always only add the karma points, and change the default values to negative numbers.

[Matthew Good]

This was fixed in r4111 before this ticket was opened so that the filters use the absolute value, so it doesn't matter whether the setting is positive or negative. In r4148 I changed the default value to be positive for consistency.