The 2017-18 season has officially been announced by the Boston Lyric Opera, and it will include four opera productions. The first production will be “Tosca,” starting on Oct. 13, 2017, and running for five performances. The production will feature Elena Stikhina as Tosca and Jonathan Burton as Cavaradossi. Following “Tosca” will be “Mr. Burke & Mr. Hare” starting Nov. 8, 2017, at {…}