Begins the process of abandoning a quest in the player's quest log. To finish abandoning the quest, call AbandonQuest().
This function must be called to select a quest in order for GetAbandonQuestItems() or  GetAbandonQuestName() to return valid data.
See also Quest functions.
Signature:
SetAbandonQuest(questIndex)
Arguments:
questIndex- Index of a quest in the quest log (between 1 andGetNumQuestLogEntries()) (number)