[firedrake] firedrake-install currently failing due to network issues at Argonne

Dear firedrakers, As of early this morning, firedrake-install/update have not been able to complete: failing when installing PETSc. This is, unfortunately, due to circumstances beyond our control. Argonne, where PETSc is hosted, has taken down one of the servers necessary in this process due to a "cyber incident". It is unclear when it will be back on line at this point. Please see https://lists.mcs.anl.gov/pipermail/petsc-users/2018-March/034836.html for more details. I will update when we expect installation to be working properly again. Apologies! Lawrence