review for fixes of bugs due to acquisition black magic

Hi all,

I committed fixes in 4.3.x branch for two nasty acquisition bugs.

I'd like to get some feedback :

- 
https://github.com/plone/Products.CMFPlone/commit/e20ea907d2854ee7ad41e9953b64889ee7431b49 


is a fix for https://dev.plone.org/ticket/13793

but it might break some sites that have wrongly built URLS, iow URLS 
where content is currently made accessible through acquisition.

- 
https://github.com/plone/Products.CMFPlone/commit/6d6710728b35b97e2f328c454c8688346612b1e1 


is a fix for https://dev.plone.org/ticket/13603

but it breaks backward compatibility by forbidding use of relative paths.

In both cases, I think that not fixing the bug is worse than the 
side-effect of the fix. But maybe some of you disagree... or have ideas 
for better fixes.

Looking forward to hearing from you all.
-- 
Godefroid Chapelle (aka __gotcha) http://bubblenet.be


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