refactor field's value retreiving from the widget (eg 'display value' concept):
* kill field's display_value method, since getting value specified in a previous
post or in req.form should be the widget responsibility (the widget nows what
inputs to display, not the field)
* new typed_value / format_value on widgets, mainly to ease overriding
[MESSAGES CONTROL]
disable-msg = C0301
[VARIABLES]
# Enable / disable this checker
enable-variables = yes
additional-builtins = _, display_name
[BASIC]
required-attributes=
attr-rgx = (w|[a-z_][a-z0-9_]{2,30})
variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$
argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception