total base count in bam file
./bam stats --in <inputFile> [--basic] [--qual] [--phred] [--pBaseQC <outputFileName>] [--cBaseQC <outputFileName>] [--maxNumReads <maxNum>][--unmapped] [--bamIndex <bamIndexFile>] [--regionList <regFileName>] [--requiredFlags <integerRequiredFlags>] [--excludeFlags <integerExcludeFlags>] [--noeof] [--params] [--withinRegion] [--baseSum] [--bufferSize <buffSize>] [--minMapQual <minMapQ>] [--dbsnp <dbsnpFile>]