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They are needed for analytic assembly

Correct handling of gravitational flux contributions requires the
mpfa framework to be completely re-designed.

The Doxygen comment `//!` refers to the line after the comment. If
the comment should refer to the same line, `//!<` has to be used.

* Generalize bounding box tree
* Extract intersection algorithms
* Fix some epsilon issues in interval (1d) and triangle (2d) point intersection
* Adapt point sources to new interface
* Adapt fv grid geometry to new interface -> element map moved to basefvgeometry
* Improve bounding box tree test

This commit affects all properties and member variables

This commit affects all properties and member variables

Dennis Gläser authored Dec 06, 2017 and Timo Koch committed Dec 12, 2017

In adaptive grids it might be necessary to store more interaction volume
data. Memory reallocation must be avoided as the stored pointers lose
validity otherwise.

This implies that all processes use the same interaction volume on the boundaries. We typically
use the o-method on boundaries, where this is guaranteed.

* specialized for box/cc