Add support for samples with number

[jmonroynieto]

The program halts after execution and at no point is there a check enforcing this nor is it immediately obvious in the documentation. The user realizes this by reading the logs.

Instead of checking this from the ids file, could we add a filtering step to take out any items that are part of the ids? I'm not a C++ user so a PR might take me some time to work out.

finestructure4/finestructure/data.h

Line 142 in 0599326

cout<<"This is the symptom if individual names start with a number."<<endl<<"Try re-running with -X -Y"<<endl;