replaced "isabelle components_checksum" shell script by "isabelle build_components" in Scala, with more functionality;
more robust Component.Archive name: avoid rm_tree accidents;
(* :mode=isabelle-options: *)
section "Admin tools"
option isabelle_components_server : string = "lxbroy10.informatik.tu-muenchen.de"
-- "user@host for SSH connection"
option isabelle_components_dir : string = "/home/isabelle/components"
-- "webspace for ISABELLE_COMPONENT_REPOSITORY"
option isabelle_components_contrib_dir : string = "/home/isabelle/contrib"
-- "unpacked components for remote build services"