Add author to reclassifications as well

Extract new classification object creation to classsifition.js:createNew.
Toggle reclassify button wrt. status of classification and role of user

Also, allow continuing of previously unfinished draft classification

Can reclassify if there is no draft + (is kavi or no classifications exist or old classification is old)

Can continue if there is a draft + (is kavi or the author or there is no author)

Access control to be verified later...
Show "most reasonable" classification in details-box

* If there's a draft but a registered one before that, show the registered one.
* status text shows that a draft exists in that case