Revert "Matched assembly versioning to actual versioning"

This reverts commit 8e51bf1.

.appveyor.yml

@@ -58,7 +58,7 @@ after_build:
 - ps: |
     If (Test-Path "bin/OpenSim.Framework.Servers.dll") {
       $halcyon_version = (Get-ChildItem -Path bin/OpenSim.Framework.Servers.dll | % versioninfo).ProductVersion
-      Update-AppveyorBuild -Version "$halcyon_version-$env:APPVEYOR_BUILD_NUMBER"
+      Update-AppveyorBuild -Version "0.$($halcyon_version.Substring(0, $halcyon_version.lastIndexOf('.')))-$env:APPVEYOR_BUILD_NUMBER"
     }
 - ps: Rename-Item -Path bin -NewName halcyon
 

OpenSim/Framework/Servers/VersionInfo.cs

@@ -27,10 +27,10 @@
 
 using System.Reflection;
 
-// Version format is Major.Minor.Patch.Revision
-// Using the "build" number, the 3rd value, as patch is a bit non-standard from MS's perspective. However this is what https://semver.org/ uses it as.
-// Using a * for the last number means auto-fill with the # days since 2000. Good for us here as we've always historically used the revision field as a unique ID value. Originally it was the SVN revision number, but since the switch to git that went away.
-[assembly: AssemblyVersion("0.9.40.*")]
+// Using a * for the third number means auto-fill with the # days since 2000. Good for us here.
+// That only leaves us with two in front, so we'll divide the first number by 10.
+// i.e. 9.18.R in the assembly is presented as 0.9.18.R
+[assembly: AssemblyVersion("9.40.*")]
 // Do not provide AssemblyFileVersion and it will be kept in sync.
 
 namespace OpenSim
@@ -56,7 +56,7 @@ private static string _Initialize()
             if (_revision == null)
             {
                 Version ver = typeof(VersionInfo).Assembly.GetName().Version;
-                _version = String.Format("{0}.{1}.{2}", ver.Major, ver.Minor, ver.Build);
+                _version = String.Format("{0}.{1}.{2}", ver.Major/10, ver.Major % 10, ver.Minor);
                 _revision = ver.Build.ToString();
             }
             return _revision;