CRM-12618 This includes Nicolas Ganivet patch to prevent editing of event fee for paid additional participants, and fix to hide Record Payment checkbox for them as well.

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* CRM-12618: Event registration edit screen for additional registrants is incorrect
  http://issues.civicrm.org/jira/browse/CRM-12618
Merge pull request #770 from davecivicrm/CRM-12618

CRM-12618 This includes Nicolas Ganivet patch to prevent editing of even...