fix #15
update NEWS file
Merge pull request #17 from paulstaab/fix_issue_15

Fix issue 15
Merge pull request #16 from paulstaab/additional_sumstats

Additional sumstats
release candidate for 2.6
add subset feature to confidence intervals
add comment
remove TMP folder in tests
Merge pull request #18 from paulstaab/ci_subsets

Ci Subsets
release candidate 2 for v2.6
change cores options to issue warnings on windows
fix test error when seq-gen is not installed
release candidate 3 for 2.6