Multiple changes.

- Use the ARC memory model for release builds.
 - Move logfile to a command line switch, to avoid chicken-and-egg logging when failing to parse YAML.
 - Fix logic bug: Stop processing rules on a good match
 - Add performance timer and memory used when logging to file
 - Rename 'headers' to 'match' in configuration file, more intention revealing
 - Add logger explicit flock (unlock) at process exit

FossilOrigin-Name: 7c439d99044b8d725c2dc1a806eec14fff7f0675afb14920de3c7c2581907640

config.yml

@@ -2,15 +2,13 @@
 # Example Sieb configuration file.
 #
 
-# Default, no logging.  Relative to homedir.
-logfile: sieb.log
 
-## Rules tried before global filtering
+# Rules tried before global filtering.
+#
 early_rules:
   -
-    headers:
-      TO: mhlon@(laika|ravn)
-      received: .*sendgrid.*
+    match:
+      TO: ahlon@(laika|ravn|martini)
     filter:
       - [ reformail, -A, "X-Sieb: This matched." ]
     deliver: .whatever
@@ -27,9 +25,18 @@ filter:
 ##
 rules:
   -
-    headers:
-      x-sieb: global
-    deliver: .whoas
+    match:
+      x-one: global
+  -
+    match:
+      Subject: .*\s+corepacket\s+.*
+    deliver: .balls
+    filter:
+      - [ reformail, -A, "X-Sieb: Boom!" ]
+  -
+    match:
+      x-three: global
+
 
   # # Magic "TO" which means To: OR Cc:
   # -