Scope out the current MD infrastructure within Mantid

[AntonPiccardoSelg]

In order to get a better picture of what needs to be done for porting MDWorkspaces and MDAlgorithms to a distributed environment, we have to make sure that we understand the current infrastructure and its interdependencies well. The task is mainly a review of the current code. We need to

• Understand how multi-dimensional algorithms and data structures are currently used at other facilities, ie what is the reduction sequence.
• Understand and describe MDHistogramWorkspaces and MDEventWorkspaces. This includes their structure as well as how they are created (from MatrixWorkspace types).
• Categorize the different MDAlgorithms and understand in which way they make use of implementation details of the current data structures.