Warn if a macro file has a POD directive on the first line but don't fail. #962
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This adds a new line to the beginning of the code for a macro file that starts with
=
which will usually mean an invalid POD directive on the first line of the file (and is invalid in any case for the first character of a Perl file).In that case a warning is also shown. This warning will only be shown if the view_problem_debugging_info flag is set (this corresponds to the webwork2 permission that ta's and above have).
This is to address issue #961.