Missing parameter_line_number in some output file names

[RossBoylan]

It appears the parameter line number suffix has been omitted from a few of the output file names in input.c.

E.g., for ward_output.

    // Concatenate file name
    strcpy(output_file_name, model->params->output_file_dir);
    strcat(output_file_name, "/ward_output");
    strcat(output_file_name, ".csv");
    ward_output_file = fopen(output_file_name, "w");

time_step_hospital_interactions and time_step_hospital_output are the only other ones I see missing the line number, although it's possible the file name passed to write_network() has issues too (haven't traced it through).

Every other one looks like this:

    strcpy(output_file_name, model->params->output_file_dir);
    strcat(output_file_name, "/transmission_Run");
    strcat(output_file_name, param_line_number);
    strcat(output_file_name, ".csv");

    output_file = fopen(output_file_name, "w");

If the omission was not deliberate, it would probably be good to fix.

Since I'll be running in parallel I'll need more than that anyway, but I thought I might flag it.

[roberthinch]

I suspect it was more of an oversight, we've not used this file in any large scale runs yet. Agree it should be standardised.