Extend Python interface

[Nick Draper]

Extend the python interface in the following areas:

1. Graph plotting: log scaling
2. Graph plotting: ensure we can scale 2D and 3D graphs
3. Accessing table workspace values
4. Displaying table workspaces within Mantidplot
5. Accessing WS instrument and detector classes (example - calculating solid angle for a spectrum from the sample position).
6. Accessing WS log values from python

This is required to be completed before the user "python in mantid" courses

[Martyn Gigg]

(In [2497]) Added TableWorkspace to PythonAPI. This is quite minimal and unfortunately a bit clunky due to the templated nature of the retrieval functions and Boost Python limitations. Re #627

[Martyn Gigg]

(In [2502]) Added instrument support to PythonAPI with a demo script for calculating the solid angle. Re #627

[Martyn Gigg]

(In [2506]) Added support for sample log retrieval in Python. There is a sample script in the scripts directory. Re #627

[Martyn Gigg]

(In [2512]) Added a few commands to the MantidPlot Python interface so that controlling graphs is a little easier. Re #627

[Martyn Gigg]

(In [2513]) Update to an exmplae script. Re #627

[Martyn Gigg]

(In [2515]) Exposed a few extra methods to Python for IDetector. Closes #627

[Martyn Gigg]

(In [2532]) Small adjustment to the syntax for scaling axes to make switching types eaiser. Closes #627

[Martyn Gigg]

(In [2533]) Added the ability to change curve titles in to Python. Re #627

[Martyn Gigg]

(In [2535]) Fix to merge plots command so that the curve that is merged retains the correct style. Re #627

[Martyn Gigg]

(In [2537]) Retrieving a matrix/table workspace from Python now causes an exception to be thrown if the workspace is not of the correct type. Re #627

[Martyn Gigg]

(In [2538]) Python is now the default scripting language in MantidPlot. Re #627

[Stuart Campbell]

This ticket has been transferred to github issue ​1475