[wp-docs] New page - Moving to PHP 5

[mrmist]

The re-draft of the page is now up.  I've added the specific questions 
and answers and shifted the background talk to the end where it has less 
prominence.

You'll note that many of the answers are generalist.  This is an 
unfortunate side-effect of the myriad of possibilities out there.  We 
can only really hope to give answers that apply to the majority - for 
which, I think, the switch will be no problem at all.

There will be the odd duff theme or plugin, but I'd expect these to be 
running on outdated platforms in any case.  We can't help everyone ;)

Let me know what you think of the results.
-- 
mrmist