Re #9328. It appears that make appends the compile flags when
calling the linker and ninja does not.

refs #6332

Cleaned out a load of older checking code. Separately load up pv_plugins from normal plugins if paraview is present.

Minor syntax fix for the Vates dependencies so that the packages will build. The spec files are very picky about spaces etc. Refs #3627

Added a Paraview plugin, PeaksReader, to load .peaks file to visualize them. Needed to add a link to the Crystal library. Refs #3232.
Added a vtkPeakMarkerFactory to render single-crystal peaks (as points). Not totally finished. Refs #3232.
Made vtkDataSetFactory::initialise() take a Workspace_sptr instead of a IMDWorkspace_sptr. This allowed the visualization of a PeaksWorkspace. Still needs tests. 
Made the MultiDimensionalDbPresenter::getMesh() method return a vtkDataSet* (instead of vtkUnstructuredGrid*) to be more general.
Attempted to speed up/parallelize vtkThresholdingHexahedronFactory without much improvement so far. Refs #3271.
Made a MockObjects.hh file to reuse mock objects code in VatesAPITest. Fixes #3291.
Sped up setUp of EventListTestPerformance; also InstrumentRayTracerTestPerformance. Refs #3217.

re #3120. MDEvents put into plugins directory of MantidPlot as part of wxs script. This has been verified to work locally. Now enables Vates package to work fully after install. Previously complaining due to missing dependent library. 

re #3115. Merged with Michael's changes and set-up so that the system path can be modified and reset by the installer on windows.

re #2607. Better CMake build script, only need to specify ParaView_DIR now. Add missing add_subdirectory.

re #2607 Descriptive naming and rearranging. In brief All VisitPresenter references replaces with VatesAPI. VisitPresenters does not convey enough meaning. We are using a presenter pattern at various points, but its really a VATES/VTK-based API to to the underlying Mantid framework. Secondly VisIT is no longer the sole target Vis Platform, so naming should reflect this.

re #2607 Create basic reader. Check that VisIT plugins still work. Note that there are 3 new options to control via CMake: 1) USE_PARAVIEW, which is set to on by default. 2) ParaView_DIR, which is required by the paraview plugins 3) VTK_SOURCE_DIR, which is required so that presenters have access to the include files used by Paraview vtk. If USE_PARAVIEW is set to off, then the latter two options are not important and VisIT plugins will be built instead.