The problem is that the ```api``` module is not doing much for us, so, IMHO, it will be removed soon. 

It is actually used to provide "vectorial" (on assets) version of the functions provided by the ```scientific``` module.

If the latter functions will be universal functions (able to compute risk on multidimensional arrays of hazard data), we can get rid of the ```api``` module. Before this will occur, I will take those functions and the corresponding tests.