remote client can add a photo in a category thanks to the web API. A new
"upload" directory is created (write access required on the base
directory). Uploaded photo have path such as
upload/<year>/<month>/<day>/<datetime>-random.jpg. The thumbnail must come
with the "web sized" photo. The photo has no storage_category_id.
Bugs still need to be fixed and a discussion must occur before next steps.
git-svn-id: http://piwigo.org/svn/trunk@2463 68402e56-0260-453c-a942-63ccdbb3a9ee
