turboparser: a more versatile launchServeur.sh

gargantext/util/taggers/lib/nlpserver/launchServeur.sh

 #!/bin/bash
+export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/srv/gargantext_lib/taggers/nlpserver/TurboParser/deps/local/lib:"
 
+if [[ "$VIRTUAL_ENV" != "" ]]
+then
+  source /srv/env_3-5/bin/activate
+fi
 
-export LD_LIBRARY_PATH=":/srv/gargantext_lib/taggers/nlpserver/TurboParser/deps/local/lib:"
-
-source /srv/env_3-5/bin/activate
-
-python server.py
-
+python3 /srv/gargantext/gargantext/util/taggers/lib/nlpserver/server.py