[Tilesathome] tilesathome rmtree issue on Windows

[Ed Loach]

I wrote:

> I've got a 5.10 Perl/ 2.39 [version corrected - Ed] 
> GD based Windows version now
> waiting for the tah server to be available for testing. 
> <snip>
> 
> If it works I'll let you know. 

And wow, does it work! On the previous version I was managing about
2 or 3 tiles (or about 16 missing tile requests) before the upload
used to fail continuously, and I had to restart the client. This
version currently is on the 49th request this morning and also once
recovered from not being able to tell if the queue was full or not
(about the time the queue went from full to empty) which it never
had before. I might also just be getting lucky with tiles that
aren't too complex, but it seems quicker as well. It looks like
resolving the rmtree problem might just have solved my other
problems which perhaps were down to resources getting eaten up by
all those still open files.

Ed