* ManagedImage fixes: ManagedImage.ExportTga() that was padding zeros on the end of 24-bit image, and Alpha-only images are now interpreted as grayscale with the alpha set to full opacity
* Renamed ManagedImage.Fill() to ManagedImage.FillArray() and made it a static member
* Added ManagedImage.ExportRaw() to export raw RGBA data ready to send to Tao.OpenGL (should speed up primpreview)
git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@1935 52acb1d6-8a22-11de-b505-999d5b087335