db4o-sp Code-SVN

Exact computation is based on BigDecimal with unlimited context - BigDecimalAdapter,
Approximate computation is based on RealInterval with fast context (type from JInterval library) - RealIntervalAdapter. Simply tested on sign of determinant.

Added basic CGAlgorithms orientation and incircle for 2D and 3D (based on operation +,-, * only). Its implementation based on robust Expression of course. Strategy design pattern is used for algorithms. Simply tested on 2D and 3D coordinates.

Support basic referencing (ISO 19111) from library JScience. Created general 2D and 3D coordinates and crs. Referencsing from JScience supports conversions, crs, cs and coordinates.

Removed class EGCDeterminant because of foundation of Expression.