DO NOT MERGE UNTIL TESTED Feature/add threadpools#27

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ghost wants to merge 4 commits intodevelopfrom feature/add_threadpools

+111-75

Commits on Mar 16, 2018

Add threadpools to bam2bw, bam2bwbases and bam2bedgraph
drjsanger
committed
Correct hts_file name for threadpools
drjsanger
committed
optoins method now has int return value
drjsanger
committed
Return type of setup_options corrected
drjsanger
committed