Small usability improvements

Replace README.md by README.rst (not finished)

report_py3o/models/py3o_server.py

@@ -6,6 +6,10 @@ from openerp import fields, models
 
 class Py3oServer(models.Model):
     _name = 'py3o.server'
+    _rec_name = 'url'
 
-    url = fields.Char("URL", required=True)
+    url = fields.Char(
+        "Py3o Fusion Server URL", required=True,
+        help="If your Py3o Fusion server is on the same machine and runs "
+        "on the default port, the URL is http://localhost:8765/form")
     is_active = fields.Boolean("Active", default=True)