[PATCH 6/7] New utility ubidump

[hujianyang]

> I envision that in the future people may want to specify PEB number
> instead of LEB number, and '-n' becomes a confusing name for the option.
> Could you please only support '--lnum', and drop '-n' altogether. Then
> in the future someone may add '--pnum' support.

Yes, you are right. I'll change it in next version.

> 
>> +"-i, --info		show explicit information about NODEs\n"
> 
> I do not understand what this means from the description. Would you
> please try to describe it better in the help text?
> 
>> +"-H, --header		show only header information\n"
>> +"-N, --node		show only NODEs information\n"
> 
> Same for these.
> 
> Thanks!
> 

-H for UBI-level info and -N for UBIFS-level info.
-i means dump UBIFS Nodes by function ubifs_dump_node, not just
scan them.

I will re-describe them.

Thanks.