Remove webwork2/PG_VERSION file and references to it in the PG code.

$ce->{PG_VERSION} is now obtained directly from the file pg/VERSION via a special exception which
allows CourseEnvironment to read that file.  (Normally CourseEnvironment only has access to files in webwork2. )

conf/defaults.config

@@ -29,11 +29,10 @@
 # file, you can put a directive in localOverrides.conf.
 
 include("conf/site.conf");
-include("VERSION");  # get WW version 
-#include("PG_VERSION"); 
-# The version of PG is now obtained from pg/VERSION
-# using code inside CourseEnvironment.pm  
-# include can only read files under the webwork2 directory 
+include("VERSION");  # get WW version  
+# The version of PG is now obtained from the file pg/VERSION
+# using code added to CourseEnvironment.pm  
+# with this one exception include can only read files under the webwork2 directory 
 
 ################################################################################
 # site.conf  should contain basic information about directories and URLs on

lib/WeBWorK/CourseEnvironment.pm

@@ -226,10 +226,10 @@ sub new {
 	}
 	# #	We'll get the pg version here and read it into the safe symbol table
 	if (-r $PG_version_file){
-		#print STDERR ( "\n\nread PG_version file $PG_version_file\n\n");
+			#print STDERR ( "\n\nread PG_version file $PG_version_file\n\n");
 		my $PG_version_file_contents = readFile($PG_version_file)//'';
 		$safe->reval($PG_version_file_contents);
-		#print STDERR ("\n contents: $PG_version_file_contents");
+			#print STDERR ("\n contents: $PG_version_file_contents");
 
 		no strict 'refs';
 		my %symbolHash2 = %{$safe->root."::"};