[gen] Added some default page and field layouts.

gen/__init__.py

@@ -372,6 +372,7 @@ class Type:
     # field, keyed by layoutType.
     cssFiles = {}
     jsFiles = {}
+    dLayouts = 'lrv-d-f'
 
     def __init__(self, validator, multiplicity, index, default, optional,
                  editDefault, show, page, group, layouts, move, indexed,

gen/layout.py

@@ -222,6 +222,10 @@ defaultPageLayouts  = {
 # A layout for pages, containing the page summary.
 summaryPageLayouts = {'view': Table('s-n!-w|-b|', align="center"),
                       'edit': Table('w|-b|', width=None)}
+widePageLayouts = {
+    'view': Table('n!-w|-b|', align="center"),
+    'edit': Table('w|-b|')
+}
 # The default layout for fields. Alternative layouts may exist and are declared
 # as static attributes of the concerned Type subclass.
 defaultFieldLayouts = {'edit': 'lrv-f'}