more doc merges

A few more nodes merged (or enhanced), and a pass at some of the
matching macros in modules/m4.c to comply with the branch
behavior.

2006-08-29  Eric Blake  <[email protected]>

	* doc/m4.texinfo (Quoting Arguments, Definitions, Define)
	(Arguments, Pseudo Arguments): More doc merges from the branch.
	(Macro expansion): Turn example into test.
	* modules/m4.c (undefine, popdef): Accept multiple arguments.
	(define, pushdef): Warn on non-text macro name.
	(ifelse, m4_dump_symbols, defn, traceon, traceoff): Tweak
	warning/error messages.
	(ifdef): Ignore extra arguments.
	* m4/symtab.c (m4_symbol_value_copy): Avoid memory leak.
	(m4__symtab_remove_module_references): Check that there is no leak.
	* tests/macros.at (pushdef/popdef): Update to new message.
	* tests/builtins.at (define): Likewise.
	* tests/freeze.at (loading format 1): Likewise.
	* tests/modules.at (AT_CHECK_M4_MODTEST): Likewise.

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