Added aliases so that they can be called as if they were classes
with only static methods.

getTwotheta now raises a deprecated msg. It will be removed in a future
release.

Introduces a macro to decalare WorkspaceProperty exports.

The policy avoids have to have a useless intermediary wrapping function and
creates code that is much more resuable

This produces a writable numpy array.

Ensure that inplace binary ops in Python call the correct method.

Keep consistency with C++ and the current interface so people's
scripts will not need to many changes.

Adds a generic plugin (module) loader for importing additional
python modules at start up

Calling mtd.create_algorithm from Python checks whether the algorithm should
be managed/unmanaged so that when Python algorithms create algorithms they
are automatically unmanaged as they should be. Also tidied up a few tests
by replacing calls to Load with calls to CreateWorkspace.

This reverts commit 73d6eb8f. Complex windows errors need fixing first.

There are now read methods that create a 1D read-only numpy array around the existing data spectra and extract methods that pull out all of the data into 2D arrays. They still need profiling.