Removed not-in-use "Display notification window" on blocks setting, and fixed it so that clicking on the "Notify On" checkbox once again enables/disables the related controls on the Settings 2 page.

git-svn-id: https://peerblock.googlecode.com/svn/trunk@690 d3e0e2f6-51e0-11de-b413-c5e99dc0a8e2