Change the name of the method convertToString to toString.
A FEB ID and Hybrid ID are no longer required to run an analysis.  By default, an analysis processes data from all FEB ID/Hybrid ID pairs.
Use an unordered_map to store a 2D baseline histogram for each FEB/Hybrid pair.  This allows processing of data from all FEB's and hybrids without having to run the svt_qa application multiple times.  For now, processing of data from a specified FEB/Hybrid pair is no implemented but will be added in a future revision.  The mean baseline and noise for each channel are now calculated and plotted using the baseline histogram projections.