Fix status of new pages

New pages should default to draft, not existing pages!

Fixes #261

(cherry picked from commit f06949fd35dcf699d5fffc1b4e0c7adcdf0cb1bb)
Only show 'View live version' when there is a live version

That is, when the page is published.

(cherry picked from commit 77ffb4e1d80a7517ac972ade42fe667c83db0d86)
Put cloned pages in draft status

(cherry picked from commit c77d6e5edf8c85bffd5124691896d487f27d1c00)
History view takes VersionTracker pk, not page

(cherry picked from commit b50a84648213f6e459bad699a00dc9e3ca75b88e)
CHANGES for 0.3.1

(cherry picked from commit bf6c578928c62045d13278f785b707053449c046)
Version 0.3.1