REST client: Cannot add options

[merretbuurman]

Sometimes I need the option ?auth in GET requests to make sure the primary server is requested. I cannot pass that.

[merretbuurman]

I added the auth options (and other params accepted by HTTP GET to the methods that read handle records.
But if you pass it to the methods that write records, it is taken as one of the key-value-pairs that users want to register, so it will be added to the handle record:

URL = www.dkrz.de
VERSION = 23
auth = True

That is hardly desired. But if we delete any auth passed by the user, then users cannot register that as a key-value pair anymore, even if that's intended. Hm. Any thoughts?

Obviously we could add another parameter, e.g. force_add or so... But that might be over the top.

[merretbuurman]

(Except for that last comment, the things were done in #65 ).

[themiszamani]

We are going to support the auth options in the read handle records.
The documentation informs the users that all the values they pass in the that write records, are taken as key-value-pairs and will be added to the handle record.

[merretbuurman]

I just noticed that "type" can be repeated, so I need to pass it differently than in this PR. Please wait with merging, thanks!

[themiszamani]

#65