Return message for /gcbm/title on a simulation

[Janengethe]

Currently when you run " curl -d "title=run4" -X POST http://localhost:8080/upload/title" to get the simulation title for GCBM implementation of FLINT you get "{"data":"New {sim_title} simulation started. Please move on to the next stage for uploading files at /gcbm/upload."}". trying the same command again you get "{"data":"Simulation already exists with name {sim_title}. Please check the list of simulations present before proceeding with a new simulation at gcbm/list. You may also download the input and output files for this simulation at gcbm/download sending parameter title in the body."}". This does not indicate the simulation title "run4" despite being indicated as "title=run4" when you use curl.

[Janengethe]

I worked on this #210