Add entry for macroexpand-all to NEWS
`format' are now documented. Some flags that were accepted but not
implemented (such as "*") are no longer accepted.
+** New function `macroexpand-all' expands all macros in a form.
+It is similar to the Common-Lisp function of the same name.
+One difference is that it guarantees to return the original argument
+if no expansion is done, which may be tested using `eq'.
+
+++
** New function `delete-dups' destructively removes `equal' duplicates
from a list. Of several `equal' occurrences of an element in the list,