Removed using namespace directive from header file, removing output
property on timing problems, added initialization unit test.

This is particularly required to be able to use this algorithm in the
post-processing step of a live data run. Unless this new property is
set to false, things fail on the second time around because the monitor
workspace has been cleared out of the accumulation workspace.

Also add tests for this.

There's a call to ConvertToMatrixWorkspace if the option to preserve
events is off in a live data run. This propagates any monitor workspace
through this algorithm, though note that in the case of the SNS listener
at least a Rebin or something needs to be performed on the monitor
workspace to set the X boundaries.