[osg-submissions] DatabasePager modifications

[Serge Lages]

Hi Robert,

Here are some modifications to the DatabasePager, with the possibility to :

- Get or set the target number of PagedLOD children to remove per frame.
- Get or set the minimum number of inactive PagedLOD to keep.

Corresponding environment variables have been added too.
The default values reproduce the previous DatabasePager behavior.

Changes have been made using the current SVN head revision.
Cheers,

-- 
Serge Lages
http://www.magrathea-engine.org
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