proto_rpcjson: improve debugging message
proto_xmlrpc: delete buffers, allow gc to free memory

The garbage collector may kick later in, but we can tell it soon enough
that intermediate buffers are free.
rpc_json: try harder to use the correct auth realm for requests

While switching from super-user to user authentication, we need to
align the authentication proxy client.
gitignore: /dist folder contains packages, not to be versioned