* tesseract.detect_orientation(): Use a temporary file instead of stdin
  to transmit the image to Tesseract. Tesseract 3.04 doesn't support
  stdin + "-psm 0" (regression ?)
* tesseract.detect_orientation(): Improve output parsing reliability
* optim: Avoid unnecessary convert to RGB and allow using image formats
  different from PNG
* TextBuilder + Cuneiform: add extra settings for Cuneiform
  (cuneiform_dotmatrix, cuneiform_fax=False, cuneiform_singlecolumn

Signed-off-by: Jerome Flesch <jflesch@gmail.com>