Tweaks to rclone authorize

* Document the headless / remote setup procedure
  * Move Config constants into fs
  * Parse arguments in main for Authorize

docs/content/remote_setup.md

@@ -0,0 +1,88 @@
+---
+title: "Remote Setup"
+description: "Configuring rclone up on a remote / headless machine"
+date: "2016-01-07"
+---
+
+# Configuring rclone on a remote / headless machine #
+
+Some of the configurations (those involving oauth2) require an
+Internet connected web browser.
+
+If you are trying to set rclone up on a remote or headless box with no
+browser available on it (eg a NAS or a server in a datacenter) then
+you will need to use an alternative means of configuration.  There are
+two ways of doing it, described below.
+
+## Configuring using rclone authorize ##
+
+On the headless box
+
+```
+...
+Remote config
+Use auto config?
+ * Say Y if not sure
+ * Say N if you are working on a remote or headless machine
+y) Yes
+n) No
+y/n> n
+For this to work, you will need rclone available on a machine that has a web browser available.
+Execute the following on your machine:
+	rclone authorize "amazon cloud drive"
+Then paste the result below:
+result>
+```
+
+Then on your main desktop machine
+
+```
+rclone authorize "amazon cloud drive"
+If your browser doesn't open automatically go to the following link: http://127.0.0.1:53682/auth
+Log in and authorize rclone for access
+Waiting for code...
+Got code
+Paste the following into your remote machine --->
+SECRET_TOKEN
+<---End paste
+```
+
+Then back to the headless box, paste in the code
+
+```
+result> SECRET_TOKEN
+--------------------
+[acd12]
+client_id = 
+client_secret = 
+token = SECRET_TOKEN
+--------------------
+y) Yes this is OK
+e) Edit this remote
+d) Delete this remote
+y/e/d>
+```
+
+## Configuring by copying the config file ##
+
+Rclone stores all of its config in a single configuration file.  This
+can easily be copied to configure a remote rclone.
+
+So first configure rclone on your desktop machine
+
+    rclone config
+
+to set up the config file.
+
+Find the config file by running `rclone -h` and looking for the help for the `--config` option
+
+```
+$ rclone -h
+[snip]
+      --config="/home/user/.rclone.conf": Config file.
+[snip]
+```
+
+Now transfer it to the remote box (scp, cut paste, ftp, sftp etc) and
+place it in the correct place (use `rclone -h` on the remote box to
+find out where).