#88 PLY export bad header

[Steve]

Both MeshLab and Blender require that I modify the header of a ply file written by ASSIMP in two places.

1) replace the following line
Created by Open Asset Import Library - http://assimp.sf.net (v3.0.1270)
comment Created by Open Asset Import Library - http://assimp.sf.net (v3.0.1270)

2) replace keyword vertex_indices with vertex_index. e.g.
property list uint uint vertex_indices
property list uint uint vertex_index

I can see that these problems persist in the current head.
http://assimp.svn.sourceforge.net/viewvc/assimp/trunk/code/PlyExporter.cpp?content-type=text%2Fplain

Documentation for PLY format here
http://local.wasp.uwa.edu.au/~pbourke/Dataformats/ply/

Great library and I'm really pleased to see the export functionality.
Many thanks.

[Steve]

For vertex colouring, uchar red/green/blue instead of float r/g/b also seems to be more widely accepted.

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[Kim Kulling]

see: https://github.com/assimp/assimp/issues/122