MANAGER: Now the feeding and retrieval stage are completely separated.

No processing at all is done in the feeding method.
Part of #38.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
DESCRIPTORS: Update calls to the manager new API

Part of #38.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
ALGORITHMS: Update calls to the manager new API

Part of #38.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
TESTS: Update calls to the manager new API

Part of #38.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>