l.a.v.__init__ : module documentation

Standard validators.

validators in here should be dead simple, as they are mirrored inside PostgreSQL as stored procedures.

See README.txt for discussion

Class	ILaunchpadValidationError	No class docstring; 1/1 methods documented
Interface	LaunchpadValidationError	A LaunchpadValidationError may be raised from a schema field
Interface	ILaunchpadWidgetInputErrorView	No interface docstring; 1/1 methods documented
Class	WidgetInputErrorView	Display an input error as a snippet of text.