tidy flag

[Alex Dupre]

What's the purpose of the -preserve tidy flag introduced in the doc/www 
build infrastructure 2 years ago? I know what it does, but I'd like to 
know what was the problem that required its implementation, to 
understand if it's still needed. My question is due to the fact that 
-preserve option is a hack of the tidy port and it's not supported by 
the newer tidy-devel port. So the question become: should we add the 
-preserve flag to tidy-devel or can we replace/remove that flag?

--
Alex Dupre