Pyranges

- require minimum version of NCLS

- fix count_overlaps with keep_nonoverlapping=False
- fix subtract with more than 1024 intervals (new fix)

- fix overlap invert behavior
- add intersect invert flag
- fix subtract in cases where more than 1024 intervals overlapped a single interval

- fix join with slack mutating first arg
- add flag use_other_strand in join, nearest, k_nearest
- fix categorical-bug in newer versions of pandas
- add function pr.version_info() to print relevant version flags for debugging

- require bamread 0.0.10 to fix 211

- fix broken three_end/five_end code