[Paraview] PV 4.1 surface LIC plugin documentation

[Burlen Loring]

Hi All,

I've added a page to the wiki documenting the new features developed for 
the surface LIC plugin in PV 4.1. It's linked to from the main Wiki page 
under the "other" category.
http://www.paraview.org/Wiki/ParaView/Line_Integral_Convolution

in summary:

* added noise texture generator with 9 dof
* added an option to disable integrator normalization
* added a new pseudocolor shader
* added a fragment masking shader
* added image processing stages that help increase the visibility of the 
LIC and produce bright pseudocoloring
* parallelized the algorithm and added some caching to optimize 
interactive rendering
* added support for OSMesa and Apple OpenGL.
* bug fixes

I hope that the new features help produce better visualizations in a 
wider variety of situations than was previously possible. A myriad of 
parameters are exposed in the GUI to provide access to the new features, 
however I hope that the above documentation will help explain how these 
work and get folks up and running. The default values in 4.1 should 
match the old 4.0 defaults fairly closely, so there shouldn't be too 
much pain for those wishing to use the plugin as they always have.

Burlen