[osg-submissions] osgPluging pfb -- Mutlitexturing Supported & Segmentation fault fixed

[Anthousis Andreadis]

Hi

The 2 problems : osgPlugin::pfb

1)
When loading pfb files only the first texture is loaded.
Fixed in-order to check all available texture positions.

Result:: support for multitextured pfb files

2)
When loading the same .pfb file twice you get a segmentation fault.
I fixed this by replacing the "unrefDelete" command with the performer
command "pfDelete"


The changes have been tested with many pfb models both multitextured and
not.

Anthousis Andreadis
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