Added public files

Roughly added all public files. Probably missed some, though.
diff --git a/doc/efun/capitalize b/doc/efun/capitalize
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+SYNOPSIS
+        string capitalize(string str)
+
+DESCRIPTION
+        Convert the first character in str to upper case, and return
+        the new string.
+
+EXAMPLES
+        capitalize("heya!") -> "Heya!"
+
+SEE ALSO
+        lower_case(E), upper_case(E)