We're disabling the shadowed-function warning

[apjanke]

We define a package-scoped function error() inside the +logger package. Octave mistakenly thinks that this shadows the built-in error() function, and repeatedly issues warnings like this:

warning: function [...]/SLF4O/inst/+logger/error.m shadows a built-in function

So we're just doing warning off Octave:shadowed-function in PKG_ADD. That's a gross hack. See if that can be fixed.

[apjanke]

Possible workaround: convert the +logger package to a @logger class and make all the functions static methods on it.