Removed reference to q-e-gpu mailing list, since this will be closed soon.

Also: removed references to pw_users. Since we use it so little (5 posts since
Jan. 2013: likely less than the posts sent by mistake), I think there is no 
point in keeping it open.



git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11066 c92efa57-630b-4861-b058-cf58834340f0