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 specifying location of the history file.
append - True means that the provided history file will be added into
the current history database (a new db will be created if none
exist) False means that the current database will be replaced
by the new content.
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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