Get rid of references to statsAliveDataMgr; this was test code that has now been replaced with the real data management code in vcfiobio.js.
Introduce new histogram chart for insertion/deletion lengths.  Get rid of statsAliveDataManager as this has been replaced with vcfiobio.js.
This is workaround code that is temporary.   The code added works around empty cnk array bug in getRecords().  Work with Jon to fix this directly in the JS-Binary-VCF javascript Git project if this library sticks around.