RegularBox: Improve defaults and docs

Reduce surroundingspaces as it is likely that fingers won't fit for
small boxes or one with many sides.

Also add proper description instead of inheriting the one from bayonet
box directly.

boxes/generators/regularbox.py

@@ -21,11 +21,16 @@ import copy
 class RegularBox(BayonetBox):
     """Box with regular polygon as base"""
 
+    description = """For short side walls that don't fit a connecting finger reduce *surroundingspaces* and *finger* in the Finger Joint Settings.
+
+The lids needs to be glued. For the bayonet lid all outside rings attach to the bottom, all inside rings to the top.
+"""
+ 
     ui_group = "Box"
 
     def __init__(self):
         Boxes.__init__(self)
-        self.addSettingsArgs(edges.FingerJointSettings)
+        self.addSettingsArgs(edges.FingerJointSettings, surroundingspaces=1)
         self.buildArgParser("h", "outside")
         self.argparser.add_argument(
             "--radius",  action="store", type=float, default=50.0,