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Merge remote-tracking branch 'pylayers/master'
Merge remote-tracking branch 'bernard/signature' into dev

Conflicts:
	notebook/DEV-RayTracing.ipynb
add pydb.py to communicate with MS SQL and MySQL databases and a test_pydb.py to test with WHERE2 database
Merge pull request #113 from mlaaraie/master

Manage MSSQL and MYSQL databases with PyLayers