instead of four).
Added support for multiplying mesh geometry by the matrix attached to the
Lib3dsMesh structure, however this produces disjointed models so have
to the default mode to bypass this multiplication code. Will need to revisit
this in the future.
for settings options in osgDB::Registry, and added the paramter to all of the
reaader/writer plugins. The Options structure by default has an string attached
for packing basic options, however, it also can be subclassed to encapsulate
any users defined option data. In the later case both the client code *and*
the plugin need to be aware of subclass, the plugin will need to use
dynamic_cast<> to assertain its type.
