bedtools version 2.27.0

Version 2.27.0 (6-Dec-2017)

1. Fixed a big memory leak and algorithmic flaw in the split option. Thanks to Neil Kindlon!
2. Resolved compilation errors on OSX High Sierra. Many thanks to @jonchang!
3. Fixed a bug in the shift tool that caused some intervals to exceed the end of the chromosome. Thanks to @wlholtz
4. Fixed major bug in groupby that prevented proper functionality.
5. Speed improvements to the shuffle tool.
6. Bug fixes to the p-value calculation in the fisher tool. Thanks to Brent Pedersen.
7. Allow BED headers to start with chrom or chr
8. Fixes to the "k-closest" functionality in the closest tool. Thanks to Neil Kindlon.
9. Fixes to the output of the freqasc, freqdesc, distinct_sort_num and distinct_sort, and num_desc operations in the groupby tool. Thanks to @ghuls.
10. Many minor bug fixes and compilation improvements from Luke Goodsell.
11. Added the -fullHeader option to the maskfasta tool. Thanks to @ghuls.
12. Many bug fixes and performance improvements from John Marshall.
13. Fixed bug in the -N/-f behavior in subtract.
14. Full support for .fai files as genome (-g) files.
15. Many other minor bug fixes and functionality improvements.