New warning framework

[LachlanA]

Greetings all,

There are several bug reports that would be easy to address if the warning
system were more flexible.  Notable examples are
[https://savannah.gnu.org/bugs/index.php?36743] on
Octave:language-extension, and
[https://savannah.gnu.org/bugs/index.php?46493] on malformed octal values in
scanf.

I've had some thoughts about implementing a more fine-grained warning
system, with more states per warning (allowing "quiet" or "debug" to be
specified individually, for example) and with more control over the scope of
the warning (such as restricting warnings, or the suppression thereof, to
the current file or current stack frame).

The details are at [https://savannah.gnu.org/bugs/index.php?36743], but I
can post them here if that is a better place to have the discussion.

Please let me know what you think.

Thanks,
Lachlan



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