Fixes #60

[test][test_docker] Increase a bit more the container memory for the memory-limit test (maybe a py3 requirement?)

This commit resets the container memory limit on the memory-limit test
to a higher value.  It turns out that Docker-18.09 is complaining it
cannot set the memory of the container in question to 4 Mb, possibly
because it starts up with more than that memory already (see discussion
about this here:
https://unix.stackexchange.com/questions/412040/cgroups-memory-limit-write-error-device-or-resource-busy).  Increasing the container memory to 10 Mb
and to the allocated array to 20 Mb makes the test work again.

Store the returned value and check that we have what we
wanted.

https://docs.python.org/3/library/multiprocessing.html?highlight=qsize

Not all tests were checking for None which might happen
for reason outside of tests error.

These two algorithm allow for better testing of a complete
experiment with a database used for input of both loop and
loop user algorithm.

Will test both loop algorithm and algorithm using loop

V2 information were kept in the v1 version of the schema.

This refactoring, while duplicating a bit of information about blocks
and analyzer, allows to have a better separation taking into account
the limitation of the json schema with regards to "object oriented"
definition. The main point being that new properties can't be added
to "subdefinitions" when setting "additionalProperties" to false.