[krbdev.mit.edu #5725] NIM: FEATURE: APP: Plug-in Configuration Panel improvements

[Jeffrey Altman via RT]

The plug-in configuration dialog needs to be improved to deal with
the following:

 - Modules that failed to load should be listed along with the
   reason why they weren't loaded.

 - Modules and plug-ins should display the failure count, the last
   failure time and reason.  Along with an option to reset the
   failure count or to retry loading the module.

 - The dialog should display the configuration state of a plug-in or
   module.  This should make it obvious if a plug-in is loaded but
   disabled in which case it won't load the next time NIM starts.

 - If a change requires restarting NIM, it should make this obvious.