Prefer DOF parameters over Isabelle options

etc/options

@@ -4,7 +4,3 @@ section "Isabelle/DOF"
 
 public option dof_ontologies : string = "Isabelle_DOF.technical_report Isabelle_DOF.scholarly_paper"
   -- "Isabelle/DOF ontologies (separated by blanks)"
-
-(*for install-afp only*)
-option dof_isabelle : string = "2022"
-option dof_afp : string = "afp-2022-10-27"

install-afp

@@ -151,7 +151,7 @@ fi
 
 ACTUAL_ISABELLE_VERSION=`$ISABELLE_TOOL version`
 
-ISABELLE_VERSION="Isabelle$($ISABELLE_TOOL options -g dof_isabelle)"
+ISABELLE_VERSION="Isabelle$($ISABELLE_TOOL dof_param -b isabelle_version)"
 
 if [ ${ISABELLE_VERSION} = "Isabelle" ];
 then
@@ -163,7 +163,7 @@ fi
 
 
 
-AFP_DATE="$($ISABELLE_TOOL options -g dof_afp)"
+AFP_DATE="$($ISABELLE_TOOL dof_param -b afp_version)"
 AFP_URL="https://www.isa-afp.org/release/"$AFP_DATE".tar.gz"
 
 echo ""

src/scala/dof.scala

@@ -40,6 +40,8 @@ object DOF {
   val isabelle_version = "2022"
   val isabelle_url = "https://isabelle.in.tum.de/website-Isabelle2022"
 
+  val afp_version = "afp-2022-10-27"
+
   // Isabelle/DOF version: "Unreleased" for development, semantic version for releases
   val version = "Unreleased"
 
@@ -80,6 +82,7 @@ object DOF {
   val parameters: List[Parameter] =
     List(
       Parameter("isabelle_version", isabelle_version),
+      Parameter("afp_version", afp_version),
       Parameter("dof_version", version))
 
   def print_parameters(names: List[String],