so that they both use the same implementation (the Quat code now) and the
code has been corrected to work from and to vectors which directly opposite
to one another.
This is probably due to an error on the gamasutra web page demonstrating this.
It caused left-handed rotations rather than right handed rotations. Should be
fixed now.
Also move osg across to using radians for angular paramters by default.
By defining USE_DEGREES_INTERNALLY you can get the OSG to revert to
the old style degrees. This later feature is deprecated and only meant
for helping comptability in the interim.
Also added Matrix::ensureRealized() to support the lazy initialization of Matrix, whilest keeping the implementation robust so that external calls to Matrix which get values do so on an initialized matrix.
