Added summary method to MantidRemoteAlgorithms. Refs #9523.
Added summary method to SINQ algorithms. Refs #9523.
Added summary method to WorkFlow algorithms. Refs #9523.
Added summary method to LiveData algorithms. Refs #9523.
Fix warnings left by Python script. Refs #9523.
Update calls to getOptionalMessage to be summary. Refs #9523.
Add summary to user algorithms. Refs #9523.

- Default implementation is not provided in Algorithm.cpp, so we must add it to all files that inherit from IAlgorithm.
Update tests to have a dummy summary. Refs #9523.
Fix additional Python generated warnings. Refs #9523.