* scribo/binarization/otsu_threshold.hh: Fix comparisons between
	different types.

	* scribo/io/xml/load.hh: Convert to float.

	* scribo/text/paragraphs_closing.hh,
	* scribo/text/recognition.hh,
	* src/afp/components.hh: Remove unused variables.

	* src/binarization/otsu.cc: Silent warning.

	* src/misc/morpho.cc: Check number of arguments.