| threaddb 2.0 A file mapped memory container extension

- operator<< : tdb::Box< T, D > , tdb::Cells< T, C, D, L > , tdb::Link< T, C, D > , tdb::Point< T, D > , tdb::rgrid< T, C, D, L > , tdb::rgrid_< T, C, D, L >
- operator>> : tdb::Box< T, D > , tdb::Cells< T, C, D, L > , tdb::Link< T, C, D > , tdb::Point< T, D > , tdb::rgrid_< T, C, D, L >
- rgrid< T, C, D, L > : tdb::rgrid_< T, C, D, L >
- ritem< T > : tdb::pool< T >
- sitem< T > : tdb::pool< T >