#i60307# search for strings in date formats fails.

When "Search in" is set to "Values", search the formatted values
instead of just the raw input. This fixes a 9 year old
bug that's been duplicated at least 6 times, and matches what Excel
does. Tests show even "Replace" works, and works well: if
"October" is replaced by "November", it converts the original
month from 10 to 11; it only converts the cell type to text if the
resulting text is no longer a valid date. Also added BVT tests
for the expected behaviour.

sc/source/core/data/table6.cxx

@@ -91,7 +91,7 @@ sal_Bool ScTable::SearchCell(const SvxSearchItem& rSearchItem, SCCOL nCol, SCROW
                     bMultiLine = lcl_GetTextWithBreaks(
                         *(const ScEditCell*)pCell, pDocument, aString );
                 else
-                    aCol[nCol].GetInputString( nRow, aString );
+                    aCol[nCol].GetString( nRow, aString );
                 break;
             case SVX_SEARCHIN_NOTE:
                 {