Hi,

Attached is a patch implementing a <type> Selector, which lets one select only
directories:

<filetype src="${src}">
  <type type="dir"/>
</filetype>

Or only regular files, with <type type="file"/>

I found this useful in conjunction with the <different> selector, which regards
directories as always different. Possibly this is a separate bug, but I thought
a generic 'type' selector would be a useful addition anyway.

The idea of a 'type' selector could easily be extended further to include:
 - is file readable
 - is file writeable
 - file exists
 - file is hidden

Feedback on whether/how to do this appreciated.

Thanks,

--Jeff