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As the parameter is a reference, it may cause some problems if it is
optimized out at some point (or something else, I won't pretend mastering
compiler optimizations). Instead we pass a variable in parameter and instead
of an empty string we give a string whose length is the same as the affectation
string.

This was causing issues with clang-4.0 and clang-6.0.

See !612

Because of issue in should.
See https://gitlab.bioinfo-diag.fr/vidjil/should/issues/47

We have a docker image for gcc, fine (apart from apt-get that doesn't work
with gcc:4.8 image). For clang we don't have a ready to use image so we need
to install it by hand.

Fix #4203

Add a test with constant gene in the sequence to check we detect it

See merge request !604

doc/.gitlab-ci.yml: deploy_doc

Closes #4143

See merge request !597

Backup of the current day only (and of yesterday)

See merge request !605

This will allow more lightweight backup strategies

See vdj#96

See #2964

Resolve "fichier vidjil avec clone null"

Closes #4172

See merge request !599

Link to #4172

mkdocs.yml: reorganize doc

Closes #4143

See merge request !583

Feature c/auto resize

See merge request !598

This can happen when vidjil is launched with '--no-clone' arg, or when no clone are founded
Link to #3861

older browser does not support observer methods, use a setInterval recurrent check instead

-add an observer on view and resize on change
-use a 500ms delay

doc/vidjil-algo.md: installation steps are different on releases and on git

See merge request !594

Feature c/conversion d3 v5

See merge request !561

see #4148.

as in !574, see #4131

Closes #4143

clones.js : fix clones distribution loading time issue

See merge request !595

Don't create Axes object and call available function each time.
Reuse generated value stored in model.js
Link to #4077

trim most extreme values before computing average

minimize call to axes_obj.available()
axes_obj.available() does not return a struct pointer but rebuild the struct completely at each call

-catch NaN from getSize() (can happen with distrib clones)
-use object.clone function to compute max_size

Thanks to @axel_mercier
See #4166.

Release 2020.01

See merge request !563

see #4035

See !589

fix or new feature ?
there was already some code for this feature but it wasn't working.

node movement are now made directly by the force simulation so it need to need to be applied after each computed frame