Make Drei handle package names given as options at the beginning of the buffer.
Make Drei handle package names given as options at the beginning of
the buffer.

slyrus/mcclim,swflint/McCLIM,antifuchs/mcclim,antifuchs/mcclim,swflint/McCLIM,onixie/mcclim,swflint/McCLIM,onixie/mcclim,slyrus/mcclim,onixie/mcclim