Load history from a candidate resource.
An exception is raised if resources cannot be accessed or another load
operation is already in progress.
Parameters:
source - URI corresponding to the history file.
stopOnErrors - True means stop if any load error is detected. False means
attempt to load what can be loaded if recoverable errors are
encountered.
async - Flag controlling whether load occurs in the calling thread.
If true, the load will occur in a separate asynchronous process.
If false, this method blocks until the load operation
completes or fails. Regardless of setting, the getStatus and
getLog calls are used to fetch results.
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