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       escaping the newline (ie. backslash at end of line), strip
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       report physical line number, even if the logical line in question
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       Constructor is called as:

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       It bombs (RuntimeError) if both 'filename' and 'file' are None;
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           strip leading whitespace from each line before returning it
         rstrip_ws [default: true]
           strip trailing whitespace (including line terminator!) from
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         skip_blanks [default: true}
           skip lines that are empty *after* stripping comments and
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         errors [default: 'strict']
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           single string.  Updates the current line number, so calling
           'warn()' after 'readline()' emits a warning about the physical
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