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 * Suppressed warnings from biosig code

 * refactored CMakeLists.txt except the static-part
 * Added new cmake function to enforce boost version

This will be the case until we have correct support for detecting the
corrsponding subject for the loaded data.

boost::enable_shared_from_this to get the this pointer as boost::shared_ptr

as we are not interested in debugging third party code.

[FIX #86] seg fault when loading more than one dataset, also added the basics of a navigation slice module

- Merged

- Code now makes use of OSG's ref_ptr
- Code now properly cleans up memory during shutdown

convenient.

location they are used automatically.

the short descriptions