Modified the generate_kwargs_lib.rb script so that it remembers

the previous warning level the user had set instead of just assuming
that warnings were turned on. [#8 state:resolved]

scripts/generate_kwargs_lib.rb

@@ -110,7 +110,7 @@ def generate_preamble(out)
     out.puts <<-END
 require 'fox16'
 
-$VERBOSE = nil
+old_verbose = $VERBOSE; $VERBOSE = nil
 
 module Fox
 
@@ -132,7 +132,7 @@ def go(filenames, output_filename)
   def generate_closing(out)
     out.puts "end"
     out.puts ""
-    out.puts "$VERBOSE = true"
+    out.puts "$VERBOSE = old_verbose"
   end
 
   def scan_for_descriptions(filename)