#5 Add 'remove', 'remove_copy' algorithms

[Remi Chateauneu]

Algorithms of the family 'remove', 'remove_copy' etc... must be added.

One of the difficulties is that the output range does not have the same structure (less elements) as the input range. For example, if both input and output are vector, it is not possible to know in advance where the output elements will be stored, because some of them will be eliminated.