Douglas County Museum Director Gardner Chappell admitted Tuesday he was being presumptuous when he left a comment on a Portland publication’s website saying he will soon lead the county’s 11-branch library system. The post riled members of the Douglas County Library Board, who learned about it Tuesday from board member Joe Coyne of Winchester Bay. Coyne handed out copies of the comment Chappell made in response to a story in Portland Monthly Magazine about the Northwest’s independent state of mind. Chappell wrote he was a museum director in the Umpqua Valley and “by the end of September will also direct …