-- CRM-13446, fixed upgrade if current version is less then 4.3

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* CRM-13446: Add ON DELETE Options for constraints fails
  http://issues.civicrm.org/jira/browse/CRM-13446
Update FourThree.php
Merge pull request #1819 from pradpnayak/CRM-13446

Crm 13446
Update FourThree.php

Typo fix (mising -> missing).
CRM-13550 - API - Improve validation of options
Merge pull request #1825 from colemanw/4.3

CRM-13550 - API - Improve validation of options
CRM-13550 - API - Port 2nd patch from 4.2
CRM-13550 - API - apiv2 patch from 4.2
Merge pull request #1826 from colemanw/4.3

CRM-13550 - API - Port 2nd patch from 4.2
CRM-13625 fix - Twitter text references thankyou page with session, not info page

http://issues.civicrm.org/jira/browse/CRM-13625
Merge pull request #1830 from monishdeb/CRM-13625

CRM-13625 fix - Twitter text references thankyou page with session, not ...
CRM-13632 relationship update functions, call pre, post hooks on enable, disable, update correctly from api when id is set

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* CRM-13632: Post Hook not called when a relationship is disabled via cron
  http://issues.civicrm.org/jira/browse/CRM-13632
CRM-13633 - Undefined property in CRM Mailing Event

http://issues.civicrm.org/jira/browse/CRM-13633
Merge pull request #1841 from colemanw/4.4

CRM-13397 - Contribte - Add submitOnce behavior to contribute button when confirmation page is disabled
CRM-13490 : fix for warning mentioned by dgg in issue comment (CRM-13490?#comment-53786), also code some improvement

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* CRM-13490: Addresses with required custom fields can't be deleted from the Edit screen
  http://issues.civicrm.org/jira/browse/CRM-13490
Merge pull request #1842 from pratik-joshi/CRM-13490

CRM-13490 : fix for warning mentioned by dgg in issue comment (CRM-13490?#comment-53786), also code some improvement
Merge pull request #1839 from dlobo/CRM-13633

CRM-13633 - Undefined property in CRM Mailing Event
notice fixes as mentioned in CRM-13635

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* CRM-13635: Notices when saving back-office event registrations
  http://issues.civicrm.org/jira/browse/CRM-13635
Merge remote-tracking branch 'upstream/4.3' into 4.3-4.4-2013-10-23-19-26-23

Conflicts:
	CRM/Upgrade/Incremental/php/FourThree.php
	api/v2/Contact.php
	api/v2/Contribution.php
	api/v2/Event.php
	api/v2/Participant.php
	api/v2/Pledge.php
	api/v2/PledgePayment.php
	api/v3/utils.php
	templates/CRM/common/SocialNetwork.tpl
Merge pull request #1836 from eileenmcnaughton/CRM-13632

CRM-13632 relationship update functions, call pre, post hooks on enable,...