warnings in graphics.h

[CdeMills]

While compiling said file, with configuring using the
--enable-strict-warnings, there are a number of warnings produced, mostly
about:
- initialisation of the class members should occur into the constructor
initialisation list,
- apparently, the prototype of some operators is class something operator,
while it should be class something& operator

I enclose the list of warnings. As I told, I don't see the link between
src/graphics.h.in and graphics.h. May I ask the persons who worked on this
file to review the list and possibly silence the warnings ?

Thanks in advance

Pascal
http://octave.1599824.n4.nabble.com/file/n3236200/graphics.h-warning
graphics.h-warning 
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