Clarify licensing of the compatibility packages

...since they are now no longer only sourced from Pharo.

LICENSE

@@ -1,7 +1,9 @@
 This repository contains multiple packages:
 - Squot, Squit, VersionControl come from here
-- SquotCompatibility was also initialized here, but consists mainly of code that was
-  copied and adapted from Pharo, in order to make FileSystem-Git run in Squeak.
+- SquotCompatibility-SqueakCommon was also initialized here, but consists mainly of code
+  that was copied and adapted from Pharo, in order to make FileSystem-Git run in Squeak.
+- The other SquotCompatibility-Squeak* packages contain methods from later Squeak releases
+  or Squeak Trunk that are provided for older Squeak versions.
 - FileSystem-Git and FileSystem (FS-*) are forks of packages originally hosted elsewhere.
 - Squot-CoAuthorsExtension was originally a separate project.
 
@@ -13,6 +15,13 @@ https://pharo.org/features, https://pharo.org/contribute (all last accessed 2022
 The adapations to Squeak included here are also released under the MIT license
 as described below.
 
+The code copied from Squeak Trunk was released under the MIT license according to
+https://squeak.org/license/ (last accessed 2022-07-10). The license statement in the
+Squeak image is in the class SmalltalkImage just like in Pharo, but one cannot have
+permalinks to the Squeak method from https://source.squeak.org.
+Should any adaptations become necessary to such backported methods, the adaptations
+included here are also released under the MIT license as described below.
+
 The original FileSystem-Git was released under the MIT license according to 
 http://smalltalkhub.com/#!/~FileSystemGitDev/FileSystem-Git/ (last accessed 2019-02-15) 
 and http://ss3.gemstone.com/ss/FileSystem-Git.html (last accessed 2019-02-15).