Document new 'trace' facility

Signed-off-by: Tom Eastep <teastep@shorewall.net>

Shorewall/changelog.txt

@@ -5,6 +5,8 @@ Changes in Shorewall 4.4.9
 2)  Correct handling of a logical interface name in the EXTERNAL column
     of proxyarp.
 
+3)  More robust 'trace'.
+
 Changes in Shorewall 4.4.8
 
 1)  Correct handling of RATE LIMIT on NAT rules.

Shorewall/releasenotes.txt

@@ -239,6 +239,20 @@ None.
     for export (-e option); note that -e is implicit in the 'load' and
     'reload' commands.
 
+2)  When 'trace' is specified on a command that involves the compiler, 
+    the compiler now creates a trace to standard output.
+
+    Trace entries are of three types:
+
+    Input  --- begin with IN===>.     Input read from configuration
+                                      files.
+
+    Output --- begin with CS----->.   Text written to the generated
+                                      script.
+
+    Netfilter -- begin with NF----->. Updates to the compiler's chain
+                                      table.
+
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