Merge pull request OpenGene#81 from yech1990/master

adjust the upper limit for PacBio data

restore to not to delete ofstream

Update README.md

set ver to v0.17.1

report mean read length

report error and exit when writing is failed

dont evaluate TLEN in duplication evaluation to save RAM and CPU

set version to 0.14.1

comment check_file_writable since it is always different in different OS

Update README.md