Releases for Webform Validation

IMPORTANT:
This release introduces a new syntax to specify the range for numeric validation rules.
Make sure to run update.php (after taking a backup!) to have your old syntax converted to the new one.
Also make sure to check your existing numeric validation rules to check if they are still working as expected!

Improvements:

- #1053548: Validate input as username - by alakon: add username validation rule
- #980154: Must be empty Rule doesn't work on Hidden Fields - by B-Prod: use "Must be empty" validation rule on hidden components
- #1048342: Ability to validate all hidden fields: add "hidden" component to relevant validation rules
- #1097330: Numeric validation: range inconsistency: allow custom data on validation rules to be optional
- #907288: Introduce a 'Maximum words' / 'Word limit' validation - by 8ballmedia et al: Add minimum / maximum word rule
- #1078452: "Select (or other)" Module Max Length Validation: Add support for Select (or Other) module
- #1029350: Warning: preg_match() [function.preg-match]: Unknown modifier '^' in webform_validation_webform_validation_validate() (line 370 : Add note that regex validation rule shouldn't have delimiters
- #1101748: Numeric Values Validation with range allows negative values: Refactor numeric value validator range syntax

Bugs:
- Fix problem with validation rules validating elements on multiple pages of the form
- Fix various PHP notice bugs
- #1088254: Split function deprecated, php 5.3, Numeric Range - by jtwalters: use explode() function instead of deprecated split()

- #833500: Doesn't work for fields inside a fieldset - by Gregely Varga: fix page count initialisation
- #1076876: Undefined property: stdClass::$clone_from_original_nid - by mikewink: make sure node_clone code is not run if module is not available
- #1063152: PDOException while cloning a Webform: fix PDOException on node cloning