gui: Added confirm step and fee options.

Fee options only apply to the script coin side of xmr swaps.

doc/upgrade.md

@@ -1,7 +1,27 @@
 
 ## Update basicswap version
 
-If installed through pip:
+### Docker
+
+Update only the code:
+
+    basicswap]$ git pull
+    $ cd docker
+    $ docker-compose build
+    $ export COINDATA_PATH=[PATH_TO]
+    $ docker-compose up
+
+If the dependencies and db format have changed the container must be built with `--no-cache` and the db file moved to a backup.
+
+    basicswap]$ git pull
+    $ cd docker
+    $ docker-compose build --no-cache
+    $ export COINDATA_PATH=[PATH_TO]
+    $ mv --backup=numbered $COINDATA_PATH/db.sqlite $COINDATA_PATH/db_bkp.sqlite
+    $ docker-compose up
+
+
+### If installed through pip:
 
     cd basicswap
     git pull
@@ -10,4 +30,4 @@ If installed through pip:
 
 ## Update core versions
 
-    basicswap-prepare -preparebinonly
+    basicswap-prepare -preparebinonly