Also cleans up the schema a bit.
Note that there's still a test that isnt passing

Distinguishes between uints/ints/floats for restricting
types of choices in choices list

The schema now limits the range entries according to the
specific numerical type (uint/int/float).
Also refactors out all the nose.tools.assert_true/false calls.

Any "choice" type parameter needs >=3 choices to be valid
(otherwise it could be a boolean or a constant)

Fixes failed plotter tests as well

Uses the json schema draft 6/7 keywords to better specify
the restrictions on choice-type parameters, and adds tests

Also adds tests & new objects to check validation rules.
Uses new json schema draft 7 keywords

Also bumps the jsonschema version requirement

Algorithm range parameters were previously able to be strings,
booleans, numbers, or a mix of those three.

"parameter_value" is the same as the "value" definition
defined in the commons schema

See #74

Complex numbers as parameter types are only supported in
dataformats

See #74

Update docker related information

See merge request !127

The links to the images have been updated to use docker hub and there's
also a new paragraph about beat/beat.env.example>.

Pre commit cleanup

See merge request !126

Add minimal rw tmpfs for /tmp and /run

Closes #101

See merge request !125

At least in production, some issues happened that required
to have /tmp writable. To preserve the read-only state
of the container, use a small tmpfs that is enough for
the container to run. /run is another that might be needed
so make it part of the defaults used.

Add test for setup in cxx algorithm

See merge request !124

This test ensures that the setup feature works properly.

Ensure that writing to a non existing output shows an error

See merge request !123

It has been the case for a while for beat/beat.backend.cxx>

- beat.env.python.tests 1.3.0r7
- beat.env.db.examples 1.4.0r7
- beat.env.cxx 2.0.0r4
- beat.env.cxxdev 2.0.0r4

Add optionnal environment entry to database

See merge request !122