Let users define data file location

[Avenger-Bagnarol]

In installing and running the program i found two issues.

The first is the fact that the program can't find by default the C180, ..., C180-small files in the bin directory, as they are outside. They should be copied or moved inside the bin folder, or the program should be given a path "../".

The second is that at the vary end of the run, after all the trajectories written, the program in my computer throws an "Error in `./CellDiv': double free or corruption" exception. I cannot figure out if free() is called twice for something or what else.

[pmadhikar]

Thanks for the bug report. The first one is not really a bug. The simulator requires those files to be in your working directory. I do think that users should be able to define where the files are, however.

I've gone ahead and edited this issue to a feature request.

I will create another issue for the double free error. Let's please discuss that problem there.