[IMP] significantly improve handling of trying to create a new page which already exists

# Through the menu

Rather than output a generic error (500 due to an IntegrityError),
return a templated 409 letting the user either visit the
page-which-already-exists-with-the-name-he'd-picked or open the page
creation dialog again for a second round.

An alternative would be to promote the website.prompt use to
full-blown dialog as a result of selecting "New Page" and handle the
"page already exists" case without even closing the dialog.

# Through the link dialog

Added an RPC call to check if a page already exists (essentially a
cheaper version of opening /page/whatever and checking whether it's a
200 over JSON-RPC), if the page matching the completion term already
exists, do *not* add the choice of creating the page, only provide
completions from existing pages.

bzr revid: xmo@openerp.com-20131126160148-wrk4zvz9istscwa0

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