CRM-13685 - "Manage Extensions" - Fix upgrade check

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* CRM-13685: "Manage Extension" screen should use "<" to determine upgradeability
  http://issues.civicrm.org/jira/browse/CRM-13685
Merge pull request #1882 from totten/4.3-mgext-upg

CRM-13685 - "Manage Extensions" - Fix upgrade check
CRM-12578 - Add configuration to disable civicrm.css. Deprecate extras.css.
CRM-12578 - Move setting from url to core to avoid url encoding. Fix naming of url settings.
CRM-12578 - sql - run regen.sh
CRM-12578 - Template cleanup
CRM-12578 - Upgrade - Preserve old css override behavior
Merge remote-tracking branch 'upstream/4.3' into 4.3-4.4-2013-11-03-17-29-16
sql fixes CRM-13692

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* CRM-13692: Unknown column 'civicrm_activity.source_contact_id' when using Batch Profile Update for Activities
  http://issues.civicrm.org/jira/browse/CRM-13692
removed source contact field from the list of the available profile fields, CRM-13692

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* CRM-13692: Unknown column 'civicrm_activity.source_contact_id' when using Batch Profile Update for Activities
  http://issues.civicrm.org/jira/browse/CRM-13692
fixes for regsite module
Merge pull request #1895 from kurund/regsite-module

fixes for regsite module
Merge pull request #1894 from kurund/CRM-13692

CRM-13692, fixed sql break due to activity restructure for activity batch update via profile
Merge pull request #1891 from colemanw/css

CRM-12578 - Add option to disable civicrm.css