Fix for 'wrong number of columns' error on single sample calling
Fix for 'wrong number of columns' error on single sample calling

This updates the columns in teststrandbias.R to match the output of VarDict
single sample calling. colClasses under-represents the total columns
handled but that doesn't cause issues unless we need to specifically
specify a later colClass.

AstraZeneca-NGS/VarDict,AstraZeneca-NGS/VarDict,chapmanb/VarDict,chapmanb/VarDict,chapmanb/VarDict,AstraZeneca-NGS/VarDict