Change from fastqc to falco in ref-based-rad-seq tutorial

[VerenaMoo]

I changed the tutorial to use Falco instead of FastQC.

[shiltemann]

Thanks @VerenaMoo! Could you also update the MultiQC step as needed? At least the input file should say its the output from Falco, not FastQC.

@wm75 should we update the MultiQC tool to support option "output from Falco" even if behind the scenes the same thing happens as the FastQC option (I assume), just for clarity?

[wm75]

@shiltemann maybe a combined opion FastQC or Falco ?

[shiltemann]

@wm75 yes good idea