Fix some serialization functions.

[alumi]

Summary

Minor fixes for performance improvement and file compatibility.

Changes

• Replace (apply str (interpose ...)) with clojure.stirng/join.
• Use CharBuffer to serialize FASTQ.
• Use \tab for delimiting BED fields.
  • Although BED fields can be whitespace-delimited or tab-delimited, some tools don't support whitespace-delimited BED.

Tests

• lein test :all 🆗

[codecov]

Codecov Report

Merging #122 into master will decrease coverage by 0.09%.
The diff coverage is 85.29%.

@@            Coverage Diff            @@
##           master     #122     +/-   ##
=========================================
- Coverage   84.91%   84.81%   -0.1%     
=========================================
  Files          62       62             
  Lines        4196     4196             
  Branches      412      415      +3     
=========================================
- Hits         3563     3559      -4     
- Misses        221      222      +1     
- Partials      412      415      +3

Impacted Files	Coverage Δ
src/cljam/io/vcf/writer.clj	82.75% <100%> (-0.99%)	⬇️
src/cljam/io/bed.clj	87.9% <100%> (+0.5%)	⬆️
src/cljam/io/fastq.clj	88.03% <72.22%> (-3.56%)	⬇️

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[totakke]

LGTM

[alumi]

Thank you! 😸