Spelling fixes in include/osg/LOD
Negated priority in PagedLOD when using _rangeMode==PIXEL_SIZE_ON_SCREEN
Added clampedPixelSize() methods to CullStack and CullingSet to return fabs()ed values.
Changed LOD and PagedLOD ::traverse to use clampedPixelSize() methods.
osg::PagedLOD::s/getDatabasePath() and support in PagedLOD::traverse().
osgDB::ReaderWriter::Options::s/getDatabasePath()
osgDB::Input::s/getOptions()
setting of osgDB::Input::setOptions() in ReaderWriterOSG.cpp
src/osgPlugins/ive/DataInputStream::s/getOptions()
setting of src/osgPlugins/ive/DataInputStream::setOptions() in ReaderWriterIVE.cpp
/** Set the object-space reference radius of the volume enclosed by the PagedLOD.
* Used to detmine the bounding sphere of the PagedLOD in the absense of any children.*/
inline void setRadius(float radius) { _radius = radius; }
/** Get the object-space radius of the volume enclosed by the PagedLOD.*/
inline float getRadius() const { return _radius; }
/** Set the number of children that the PagedLOD must keep around, even if thay are older than their expiry time.*/
inline void setNumChildrenThatCannotBeExpired(unsigned int num) { _numChildrenThatCannotBeExpired = num; }
/** Get the number of children that the PagedLOD must keep around, even if thay are older than their expiry time.*/
unsigned int getNumChildrenThatCannotBeExpired() const { return _numChildrenThatCannotBeExpired; }
