Automatic loading of commands is supported.
* normal/main.c (read_command_list): New function.
(grub_normal_execute): Call read_command_list.
* normal/command.c (grub_register_command): Return zero or CMD.
Allocate CMD->NAME from the heap.
Initialize CMD->MODULE_NAME to zero.
Find the same name as well. If the same command is found and it is
a dummy command, overwrite members. If it is not a dummy command,
return zero.
(grub_unregister_command): Free Q->NAME and Q->MODULE_NAME.
(grub_command_find): If a dummy command is found, load a module
and retry to find a command only once.
* normal/cmdline.c (grub_tab_complete): Call grub_command_find to
make sure that each command is loaded.
* include/grub/normal.h (GRUB_COMMAND_FLAG_NOT_LOADED): New
macro.
(struct grub_command): Remove const from the member `name'.
Add a new member `module_name'.
(grub_register_command): Return grub_command_t.
* commands/help.c (grub_cmd_help): Call grub_command_find to make
sure that each command is loaded.
* genmk.rb (PModule::rule): Specify a module name without the
suffix ".mod" to gencmdlist.sh.
* normal/arg.c (grub_arg_show_help): Do not show the bug report
address.
* commands/help.c (grub_cmd_help): Do not print newlines after
the last command in print_command_help.
