allow categories to be edited when editing a post
Merge pull request #110 from unary/editpostcategories

allow categories to be edited when editing a post
make displaying the language selector configurable
Merge https://github.com/friendica/red into zpull
add design tool menu to appropriate pages
fix private message encryption since the input_filter mangled it
render blocks - yes these should be templates, but I've got too much to do at the moment and just want everything to fall into place quickly. The clerical work will have to wait.