@ref on sectioning command lines

[Patrice Dumas]

Hello,

@ref on sectioning lines (well, the equivalent of) is quite common in perl
documentation.  For instance, it is used in files describing changes in 
other packages, like

@chapter changes between version 2 and 3

@section Changes in @ref{SubModule}

...


I came to thinking that @ref in @node should not be accepted, but also 
that @ref should be accepted on sectioning command lines.  Is there a 
reason why we don't accept it?  My preliminary testing of such construct 
in TeX shows no specific issue.

-- 
Pat