Merge branch 'Custom-2D-view' into 'master'

Local installation

VS2N.py

__init__.py

src/Global_Var.py

src/Modules/General/callbacks.py

src/Modules/General/layout.py

src/Modules/General/spark.py

src/Modules/MultiLayer/callbacks.py

src/Modules/MultiLayer/layout.py

src/Modules/MultiLayer/spark.py

src/Modules/Neuron/callbacks.py

src/Modules/Neuron/layout.py

src/Modules/Neuron/spark.py

src/Modules/Synapse/callbacks.py

src/Modules/Synapse/layout.py

src/Modules/Synapse/spark.py

src/static/css/app.css

src/templates/index.html

tests/Modules/test_General_callbacks.py

tests/Modules/test_General_layout.py