Allow multiple \file documentation comments.

--- src/doxygen.cpp	Thu Mar  8 21:09:55 2001
+++ src/doxygen.cpp	Thu Apr  5 09:45:12 2001
@@ -441,12 +441,13 @@
       if ((!root->doc.isEmpty() && !fd->documentation().isEmpty()) ||
           (!root->brief.isEmpty() && !fd->briefDescription().isEmpty()))
       {
-        warn(
-             root->fileName,root->startLine,
-             "Warning: file %s already documented. "
-             "Skipping documentation.",
-             root->name.data()
-            );
+        //warn(
+        //     root->fileName,root->startLine,
+        //     "Warning: file %s already documented. "
+        //     "Skipping documentation.",
+        //     root->name.data()
+        //   );
+        fd->setDocumentation(root->doc.prepend(fd->documentation()));
       }
       else
       {