Simplify gpasswd's main():

Split also get_group() and change_passwd() out of main().

ChangeLog

@@ -9,8 +9,8 @@
 	* src/gpasswd.c: New functions: open_files(), close_files(),
 	update_group(). Split out from main() to simplify this (too) big
 	function.
-	* src/gpasswd.c: New function: check_perms(). Split out of main() to
-	simplify main().
+	* src/gpasswd.c: New functions: check_perms(), get_group(),
+	change_passwd(). Split out of main() to simplify main().
 
 2007-12-27  Nicolas François  <nicolas.francois@centraliens.net>