simplified release status (again), in contrast to a43898f76ae9;

--- a/Admin/Release/CHECKLIST	Wed Mar 31 12:02:52 2021 +0200
+++ b/Admin/Release/CHECKLIST	Wed Mar 31 17:15:54 2021 +0200
@@ -74,7 +74,7 @@
 
 - fully-automated packaging (e.g. on lxcisa0):
 
-  hg up -r DISTNAME && Admin/build_release -b HOL -l -O -R DISTNAME /home/isabelle/dist
+  hg up -r DISTNAME && Admin/build_release -b HOL -l -R DISTNAME /home/isabelle/dist
 
 - Docker image:
 

--- a/src/Pure/Admin/build_release.scala	Wed Mar 31 12:02:52 2021 +0200
+++ b/src/Pure/Admin/build_release.scala	Wed Mar 31 17:15:54 2021 +0200
@@ -54,15 +54,14 @@
 
   private val ISABELLE_ID = """ISABELLE_ID="(.+)"""".r
 
-  def patch_release(release: Release, is_official: Boolean): Unit =
+  def patch_release(release: Release): Unit =
   {
     val dir = release.isabelle_dir
 
     for (name <- List("src/Pure/System/distribution.ML", "src/Pure/System/distribution.scala"))
     {
       File.change(dir + Path.explode(name),
-        _.replace("val is_identified = false", "val is_identified = true")
-         .replace("val is_official = false", "val is_official = " + is_official))
+        _.replace("val is_identified = false", "val is_identified = true"))
     }
 
     File.change(dir + getsettings_path,
@@ -380,7 +379,6 @@
     progress: Progress = new Progress,
     rev: String = "",
     afp_rev: String = "",
-    official_release: Boolean = false,
     proper_release_name: Option[String] = None,
     platform_families: List[Platform.Family.Value] = default_platform_families,
     more_components: List[Path] = Nil,
@@ -453,7 +451,7 @@
 
       progress.echo_warning("Preparing distribution " + quote(release.dist_name))
 
-      patch_release(release, proper_release_name.isDefined && official_release)
+      patch_release(release)
 
       if (proper_release_name.isEmpty) make_announce(release)
 
@@ -858,7 +856,6 @@
     Command_Line.tool {
       var afp_rev = ""
       var components_base: Path = Components.default_components_base
-      var official_release = false
       var proper_release_name: Option[String] = None
       var website: Option[Path] = None
       var build_sessions: List[String] = Nil
@@ -876,7 +873,6 @@
     -A REV       corresponding AFP changeset id
     -C DIR       base directory for Isabelle components (default: """ +
         Components.default_components_base + """)
-    -O           official release (not release-candidate)
     -R RELEASE   proper release with name
     -W WEBSITE   produce minimal website in given directory
     -b SESSIONS  build platform-specific session images (separated by commas)
@@ -891,7 +887,6 @@
 """,
         "A:" -> (arg => afp_rev = arg),
         "C:" -> (arg => components_base = Path.explode(arg)),
-        "O" -> (_ => official_release = true),
         "R:" -> (arg => proper_release_name = Some(arg)),
         "W:" -> (arg => website = Some(Path.explode(arg))),
         "b:" -> (arg => build_sessions = space_explode(',', arg)),
@@ -916,7 +911,7 @@
         error("Building for windows requires 7z")
 
       build_release(Path.explode(base_dir), options, components_base = components_base,
-        progress = progress, rev = rev, afp_rev = afp_rev, official_release = official_release,
+        progress = progress, rev = rev, afp_rev = afp_rev,
         proper_release_name = proper_release_name, website = website,
         platform_families =
           if (platform_families.isEmpty) default_platform_families

--- a/src/Pure/System/distribution.ML	Wed Mar 31 12:02:52 2021 +0200
+++ b/src/Pure/System/distribution.ML	Wed Mar 31 17:15:54 2021 +0200
@@ -8,5 +8,4 @@
 struct
   val version = "repository version";
   val is_identified = false;
-  val is_official = false;
 end;

--- a/src/Pure/System/distribution.scala	Wed Mar 31 12:02:52 2021 +0200
+++ b/src/Pure/System/distribution.scala	Wed Mar 31 17:15:54 2021 +0200
@@ -11,5 +11,4 @@
 {
   val version = "repository version"
   val is_identified = false
-  val is_official = false
 }

--- a/src/Tools/jEdit/src/plugin.scala	Wed Mar 31 12:02:52 2021 +0200
+++ b/src/Tools/jEdit/src/plugin.scala	Wed Mar 31 17:15:54 2021 +0200
@@ -326,12 +326,6 @@
     if (startup_failure.isEmpty) {
       message match {
         case msg: EditorStarted =>
-          if (Distribution.is_identified && !Distribution.is_official) {
-            GUI.warning_dialog(jEdit.getActiveView, "Isabelle version for testing",
-              "This is " + Distribution.version + ".",
-              "It is for testing only, not for production use.")
-          }
-
           if (resources.session_errors.nonEmpty) {
             GUI.warning_dialog(jEdit.getActiveView,
               "Bad session structure: may cause problems with theory imports",