bump-to-19.py users: bump *all* dirs to format 18 first

[Stefan Sperling <st...@elego.de>]

Qouting myself here from IRC in case anyone missed this.
I've already lost a couple of working copies due to this problem,
so just in case this helps someone I'm pasting it here:

<stsp> when this happens with the bump-to-19.py script: "skipped: format
is 16 not 18:"
<stsp> you have basically lost your working copy
<stsp> I see no way to recover from that state
<stsp> svn upgrade won't do anything to it
<stsp> nor will the script
<stsp> because svn upgrade complains that the subdirectories aren't working copy roots
<stsp> so it won't go to format 18
<stsp> any ideas?
<stsp> the only way to avoid this I can see is as follows:
<stsp> for item in `find . -type dir | grep -v \.svn`; do svn status $item; done
<stsp> that will run status on all directories in the working copy,
bumping them to 18 in the process
<stsp> if you don't call status on each dir, it will error out too early, leaving some dirs at older formats (like 16)
<stsp> then the bump-to-19.py script works