Issue #2082023: Create _webform_validation_webform_node_types() to be compatible with both Webform 3 and Webform 4.
Issue #2082023: Remove now-unneeded _webform_validation_webform_node_types().
Issue #2104153: Make must_be_empty work on select multiples and count zero as not empty.
Issue #2104213: Zero is not empty. Use strlen().
Issue #2104305: Check components with null values allowing oneofseveral validator to check select components.
Issue #2104325: Zero is not empty also for oneofseveral validator.
Issue #2104333: Consolidate oneoftwo and oneofseveral.
Coding standards.
Issue #2110059: Add missing periods to validator descripitons.
Issue #1106524: Only allow creation of validation rules for component types that exist in the current form.
Issue #2110271: Remove oneoftwo validator.
Coding standards.
Issue #2110301: Generalize oneofseveral to someofseveral.
Coding standards.
Issue #1290218 by jfrederick: Change rule order in UI.
Issue #1290218: Better use of Drupal render system.
Coding standards.
Issue #1913494 by spheresh: Allow separate validation of composite components.
Coding standards.
Issue #1362712: Improve documentation of webform_validation_rule_save() and webform_dynamic_delete_rule().