Intermediate commit while converting to the new architecture
* Converted Filtration into StaticPersistence and DynamicPersistenceTrails
(both right now work with the underlying std::vector rather than std::list order)
* Filtration is now just an auxilliary glue (a map between Complex and Persistence)
* Whether chains are vectors or lists can be interchanged
* Added PersistenceDiagram with a simple bottleneck_distance() function
* Converted triangle, alphashapes3d, and cech-complex examples
* Lots of organizational changes
(factoring utilities out into containers.h, indirect.h, property-maps.h)
* Trying to document along the way with NaturalDocs-type comments
Write an audit for the data structure.
-DBOOST_UBLAS_TYPE_CHECK=0 is necessary since otherwise Boost's uBLAS gives a compile-time error
when it doesn't find sqrt for polynomials. It doesn't actually need it (e.g., for LU-decomposition,
but it looks for it during type check). (File a bug report with Boost?)