v0.1.6 (r309)

This release fixed two bugs.

• --read-format was not applied when computing barcode abundance, which leads to wrong barcode abundance when --read-format is used since --read-format was introduced in v0.1.1 (#60, #15). This is now fixed and you may have to rerun Chromap if you used --read-format with v0.1.1-v0.1.5.
• With some compilers and system, --read-format is initialize to all 0s and crashes the program (#62).

Some code refactor was also done but would not affect mapping results.