Expand time-stamp unit tests to cover all formatting options
* time-stamp-tests.el: Expand unit tests to cover all formatting options. These tests validate time-stamp-pattern formatting that has existed since at least Emacs 22 (released in 2007). The tests cover both documented behavior and behavior implemented to support future migrations. * time-stamp.el (time-stamp-string): Add a second argument (TIME) to open a testing seam. Have the unit tests call this public function. * time-stamp.el (time-stamp-string, time-stamp-string-preprocess): Remove the second pass through time-string--format. (Previously both functions called it.) It was used only to handle "%", but this is now handled by having time-stamp-string-preprocess not double it. Not doubling the "%" in time-stamp-string-preprocess fixes the padding of "%2%", which was discovered by the new unit tests to be wrong.
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