Merge pull request #66 from jonathanstowe/master

Document $*GROUP

Author: moritz

lib/Language/variables.pod

@@ -670,5 +670,10 @@ X<$*CWD|variable.$*CWD>
                        that evaluates to "username (uid)".  It will evaluate
                        to the username only if treated as a string and the
                        numeric user id if treated as a number.
+    ==
+    $*GROUP           The primary group of the user who is running the program. 
+                      It is an object that evaluates to "groupname (gid)".  
+                      It will evaluate to the groupname only if treated as a 
+                      string and the numeric group id if treated as a number.
 
 =end pod