debug.cc patch

[François Dumont <francois dot cppdevs at free dot fr>]

Hi

    Here is an other small patch of debug.cc ti fix the debug messae I 
introduce recently because I always use it with 3 parameters and I pick 
the wrong ones on the message format. Moreover I prefer to represent the 
before begin forward list iterator with a 'before-begin' name rather 
than a 'before begin', it is more consistent with 'paste-the-end'.

Regards

Attachment: ChangeLog.entry
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Attachment: debug.patch
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