Added the Activity Window to show all Automatic Connection Test activity.  Fixed two two bugs that were introduced in v4.9.2, one interfered with custom HTTP monitoring, another prevented Automatic Connectivity Testing from working if no test interval had ever been set.  Also changed the format for allowable URLs for custom HTTP monitoring.  Added the ability to Customize the HTTP User Agent to bypass User Agent blocks.  Added a checkbox to control the use of unique tokens on URLs, which keep network caches from masking server status.