Admin/init_components

clarified Linear_Set.next/prev: check definedness;

# -*- shell-script -*- :mode=shellscript:
#
# Author: Florian Haftmann, TU Muenchen
#
# init_components - bash source script to initialize components
# as specified in the Admin directory

while { unset REPLY; read -r; test "$?" = 0 -o -n "$REPLY"; }
do
  case "$REPLY" in
    \#* | "") ;;
    /*) init_component "$REPLY" ;;
    *) init_component "$COMPONENT/$REPLY" ;;
  esac
done < "$ISABELLE_HOME/Admin/components"