first draft of release notes for Quesa 1.7.1

[James W. W. <os...@jw...>]

I skimmed over the CVS commits since the 1.7 release, and here were  
the highlights I saw... did I miss or misstate anything?

* Updated for Intel Mac support
* Updated for 64-bit cleanness on Linux
* Implemented writing of view hint objects and improved reading of  
view hints
* Added Cartoon renderer
* Added VRML file format reader plug-in
* New functions Q3TriMesh_Optimize, Q3TriMesh_OptimizeData,  
Q3Int64_Add, Q3Int64_Subtract, Q3Int64_Uns32_Add,  
Q3Int64_Uns32_Subtract, Q3Memory_GetStatistics.
* Made plug-in loading more reliable on Windows
* Improved texture caching in the interactive renderer, so that if  
multiple texture shaders use the same texture object, only one copy  
goes into OpenGL texture memory
* Miscellaneous bugs fixed