Removal of topMsgs array

-Removed topMsgs array: too much confuse would fall upon us
-Each User has his own headMsg. These need to be initialized during the
creation of a new User (with newUser)
Name change: deleteUser

-Because screw abbreviations in function names.
-Added missing prototypes
-Removed hesitant prototypes (and functions); they’re cool, but we’re
having serious doubts about them
-Commented deleteMsg:
-Prettied source.h a little