BLD: work around problems installing data files in libqsturng
TST lowess lower precision occassional failure
BUG: lowess add error margin to integer casting closes #897
DOC add stats.inter_rater closes #733
TST: test_table sort with indeterministic sequence in some (oldest) versions
BUG compiler warning initialize k, see #897
Merge pull request #905 from josef-pkt/misc_fixes_8

MAINT more fixes    closes #831