Duplicate task and reset the state machine

[osrf-migration]

Original report (archived issue) by Hugo Boyer (Bitbucket: hugomatic, GitHub: hugomatic).

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If the simulator machine goes down in the middle of a task, there should be an easy way to:

• mark the task as stopped
• create a new task with the same settings, to be appended to the list of tasks

[osrf-migration]

Original comment by Brian Gerkey (Bitbucket: Brian Gerkey, GitHub: gerkey).

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• changed state from "new" to "resolved"

pull request #109