add generic buffer class
added classes BamIndexBinChunk.cpp and BamIndexLinearChunk
fix Makefile.am
- add SingleFileFragmentMerge class
- move operator<< for BamIndexBinChunk and BamIndexLinearChunk to bambam namespace
add BamIndexGenerator class
fix read group processing
pass more information from Bgzf deflate flush operation
bump version after fixing BAM read group processing in merging