SusiMail: Error handling fixes

More tolerant parsing of Date headers
Set a date if we don't get a valid Date header
Fix parsing long Base64 encoded headers
Fix page count after changing page size
Make attribute name parsing case-insensitive
Import mail method for debugging
Debug and log tweaks

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 2;
+    public final static long BUILD = 3;
 
     /** for example "-test" */
     public final static String EXTRA = "";