added python bindings

Try to get system tests passing. This includes temporary renaming of a method on Instrument. Re #1944.

Add a copy constructor to Instrument. Oh, and go on a const-correctness hunt that led this commit to touch slightly more than just the one class. Re #1944.

Add the exports for ISpectrum so that when a user has created a workspace with CreateWorkspace they can set up the necessary spectrum/detector links if the default is not right. Refs #3381

- Refs #3203: Implemented ISpectrum. It is the base class of EventList and Histogram and contains the spectrum number and list of detector IDs for a given spectrum.
- ISpectrum return X/Y/E vectors. EventList, e.g. calculates the histogram on the fly.
- Moved the EventWorkspace MRU list of histograms to be contained within the EventList; better code separation. Made a EventWorkspaceMRU class to encapsulate this more easily.
- Workspaces must implement getSpectrum (const/not const) to return a ISpectrum object. dataX(i), etc. methods on MatrixWorkspaces no longer need to be overridden since they call getSpectrum()
- Got rid of EventWorkspace::getEventListatPixelID() and doneLoadingData()
- replaceSpectraMap() methods offers backwards-compatibility with SpectraDetectorMaps by setting the specNo and detector list when called. Must be called AFTER creating all the spectra in a workspace.
- Refs #3318: maskWorkspaceIndex() implemented as part of ISpectrum.

Python supports multiple categories, no work really as python does not realy support categories any more.

refs #2128
Python and the mantidplot UI respects not showing algorithms if all of it's categories are hidden 

tests:
                  Normally  Hidden   What I want
in tree           Yes       No        No
in search box     Yes       No        No
typed in box      Yes       Yes       Ideally, but not too fussed
mtdHelp           Yes       No        No
intellisense      Yes       Yes       No, but not too fussed
typed in script   Yes       Yes       Yes

Final cleanup of mantidsimple. mantidsimple.py is no longer generated at runtime but sits with MantidFramework.py Re #2663

Refs #2897. Actually give toString a default so that it makes sense in most situations. This will fix the Python test failure.

Ensure that when algorithms are run using the simple API as part of a Python algorithm that they are unmanaged. If they are not then they can cause the main algorithm to be deleted before it is actaully finished./unmanaged_alg.py  Refs #1459

Refs #2930. Fix the LoadDialog python command which had stopped working and simplify the whole thing regarding the generating mantidsimple. Now it simply generates all of the functions, there is no longer a gui flag. At runtime it checks whether it can use them or not.

Refs #2650. Add abilities to the history so that any previous algorithm can be recreated plus corresponding tests."

Refs #2637. Minor modification so that using the algorithms in the command pattern is easier, mtd.createAlgorithm now returns an AlgorithmProxy. There is createBareAlgorithm for creating one without a proxy.

Refs #2635. Allow AlgorithmProperty to work in the same way as the other properties, i.e can use .name and .value on it. Ten lines of code that I should have put in last week, sorry Mathieu!

Refs #2660: Exposed more methods of EventWorkspace and EventList. Also threw PeaksWorkspace in there for later.

Refs #2749: Made a method to return a vector of data from MDHistoWorkspace and exposed it to python.