hgweb: Pass only filename instead of full path when downloading raw files.
Before this patch "filename=foo/bar" was sent and e.g. Firefox offered to save
the file as "foo-bar" instead of just "bar".
200 Script output follows
content-type: text/plain
content-length: 157
content-disposition: inline; filename=sometext.txt
This is just some random text
that will go inside the file and take a few lines.
It is very boring to read, but computers don't
care about things like that.
host - - [date] "GET /?f=37afcac6d393;file=sub/sometext.txt;style=raw HTTP/1.1" 200 -