### calc.el (calc-trail-mode,calc-refresh): Use `face' property to italicize headers.

(calc-highlight-selections-with-faces): New variable. (calc-selected-face, calc-nonselected-face): New faces. calccomp.el (math-comp-highlight-string): Use `calc-highlight-selections-with-faces' to determine how to highlight subformulas. calc-sel.el (calc-show-selections): Change message to something appropriate. calc.texi (Making Selections, Selecting Subformulas) (Customizing Calc): Mention how to use faces to emphasize selected subformulas.

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