This commit adds asserts to ensure that the preconditions on
the points_ list are met when calling the function, namely:
- the list has at least two elements
- the first and last element are at abscissas X_MIN and X_MAX

Moreover, this commit moves the (p != points_.begin()) check
out of the if clause, and into an assert as well.

This ensures that if a bug happens here again, we will catch
it instead of sweeping it under the rug.

Théotime Grohens authored 5 years ago and David Parsons committed 5 years ago

The Fuzzy::clear() function completely discarded the points_ list,
but was supposed to reset it to its initial state with two
points at (X_MIN, 0.0) and (X_MAX, 0.0).

This commit fixes the function.

Took aevol_run.cpp's header as reference header and set it for all Aevol source files.

Each Habitat has a PhenotyipcTarget handled through a PhenotypicTargetHandler.
It can either be its own private instance or a shared instance among
the whole World (for now, only shared mode is fully functional).

The `point` class was previously changed to `std::pair<double,double>`,
with commit 609b11ae. The shortcoming being that members got to be called
`first` and `second`.

The C++ convention is for class-names to be capitalized.
Unlike file names which should be lowercase.