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Fixed a test that was failing on CRAN's Fedora gcc environment. (#827)
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Added a new option,
tutorial.exercise.throttle, to slow down successive exercise execution. This option should be set to the number of seconds a user will have to wait between performing code executions. The option defaults to 1 second to deter rapid code executions. To disable submission throttling, calloptions(tutorial.exercise.throttle = 0)within your setup chunk. (@internaut, #818)