[Bug-wget] "output document" suggestion

[formes01]

I have a small suggestion for Wget.

In the current version of Wget, 'output_document' command in wgetrc can't be 
just disabled in command line, it can be only overridden with '-O' by something 
else.
If we have 'output_document = -' in wgetrc, we can't save a document with its 
'natural' name without redirection and specifying a name.

I think it would be useful to have a command-line option disabling 
'output_document' setting while preserving the default behavior (save to the 
current directory to a file with the name from URL).