PDFMaker: introduce pdfmaker/use_original_image_size parameter to disable an automatic image scaling #1463
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#1461 の対応
pdfmaker/use_original_image_size
がtrueのとき、かつmetricsに何も指定がないときに、reviewincludegraphicsには空白文字1つが渡るようになる。デフォルトはnil。(完全に空だとimageメソッド内などで
present?
判定でfalseになってしまうので、TeX側には意味はないがRubyロジック側には意味がある文字として空白文字を採用した。ロジック側を直すのは副作用がいろいろありそうなので…)