add a changes entry

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+Changed: The GridIn::read() function variant taking a filename string no
+longer uses PathSearch to try to find an appropriate file. Instead, the
+function requires now that the filename string is a valid relative or
+absolute path to mesh file in question. Additionally, GridIn::read() now
+throws ExcFileNotOpen instead of PathSearch::FileNotFound.
+<br>
+(Matthias Maier, 2024/01/08)