more backend work for virtual folders, add support for pending db listeners, cleanup way db's are created and opened, r/sr=mscott 11051

mailnews/db/msgdb/public/nsMsgDBCID.h

@@ -42,16 +42,36 @@
 #include "nsIFactory.h"
 #include "nsIComponentManager.h"
 
+// 03223c50-1e88-45e8-ba1a-7ce792dc3fc3
+#define NS_MSGDB_SERVICE_CID \
+{  0x03223c50, 0x1e88, 0x45e8, \
+    { 0xba, 0x1a, 0x7c, 0xe7, 0x92, 0xdc, 0x3f, 0xc3 } }
+
+#define NS_MSGDB_SERVICE_CONTRACTID \
+  "@mozilla.org/msgDatabase/msgDBService;1"
+
+#define NS_MSGDB_CONTRACTID \
+  "@mozilla.org/nsMsgDatabase/msgDB-"
+
+#define NS_MAILBOXDB_CONTRACTID \
+  NS_MSGDB_CONTRACTID"mailbox"
+
 //	a86c86ae-e97f-11d2-a506-0060b0fc04b7
 #define NS_MAILDB_CID                      \
 { 0xa86c86ae, 0xe97f, 0x11d2,                   \
     { 0xa5, 0x06, 0x00, 0x60, 0xb0, 0xfc, 0x04, 0xb7 } }
 
+#define NS_NEWSDB_CONTRACTID \
+  NS_MSGDB_CONTRACTID"news"
+
 // 36414aa0-e980-11d2-a506-0060b0fc04b7
 #define NS_NEWSDB_CID                      \
 { 0x36414aa0, 0xe980, 0x11d2,                  \
     { 0xa5, 0x06, 0x00, 0x60, 0xb0, 0xfc, 0x04, 0xb7 } }
 
+#define NS_IMAPDB_CONTRACTID \
+  NS_MSGDB_CONTRACTID"imap"
+
 // 9e4b07ee-e980-11d2-a506-0060b0fc04b7
 #define NS_IMAPDB_CID                      \
 { 0x9e4b07ee, 0xe980, 0x11d2,                  \