ACTION-642 Annotate impl report on wobbliness of this requirement

Given the updates to the text, I actually do not think the implementation 
reports need annotating. 

For error messages that interrupt the user's flow of interaction, user 
agents SHOULD enable the user to easily return to the page that the user 
was previously interacting with. Note that this ideally implies returning 
to the previous user agent state -- including the results of user input 
and dynamic processing --; however, this may not be feasible under all 
circumstances.".

http://www.w3.org/2006/WSC/drafts/rec/rewrite.html#error-common
If anyone disagrees, just say so, and I'll be glad to do it.