bug#18579: 24.3.93; vc-bzr-after-dir-status should not skip ignored files

[Dmitry Gutov]

Here's a minor example of it being used:

1. Create a new file in an existing repository, open the vc-dir buffer, 
see it listed as "unregistered".

2. Type `M-x vc-ignore', select the current file, press RET. Its name is 
added to .gitignore.

3. Refresh the already opened `vc-dir' buffer. That file is now listed 
as "ignored".

This somewhat mirrors the behavior of edited -> up-to-date status 
change, except the info in `vc-dir' doesn't update automatically. Which 
could be considered a separate bug.