simplify journaling of expiring unborn messages

don't use a separate journal command anymore, but handle them like
regular expirations, and let the entry purge loop at the end cleanup
them.

src/sync.c

@@ -1319,14 +1319,14 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
 				}
 			} else {
 				if (srec->status & S_NEXPIRE) {
-					JLOG( "= %u %u", (srec->uid[F], srec->uid[N]), "expire unborn" );
+					srec->status = S_EXPIRE | S_EXPIRED;
+					JLOG( "~ %u %u %u", (srec->uid[F], srec->uid[N], srec->status), "expire unborn" );
 					// If we have so many new messages that some of them are instantly expired,
 					// but some are still propagated because they are important, we need to
 					// ensure explicitly that the bulk fetch limit is upped.
 					if (svars->maxxfuid < srec->uid[F])
 						svars->maxxfuid = srec->uid[F];
 					srec->msg[F]->srec = NULL;
-					srec->status = S_DEAD;
 				}
 			}
 		}

src/sync_state.c

@@ -298,7 +298,6 @@ load_state( sync_vars_t *svars )
 				case '+':
 				case '&':
 				case '-':
-				case '=':
 				case '_':
 				case '|':
 					bad = sscanf( buf + 2, "%u %u", &t1, &t2 ) != 2;
@@ -364,12 +363,6 @@ load_state( sync_vars_t *svars )
 						debug( "killed\n" );
 						srec->status = S_DEAD;
 						break;
-					case '=':
-						debug( "aborted\n" );
-						if (svars->maxxfuid < srec->uid[F])
-							svars->maxxfuid = srec->uid[F];
-						srec->status = S_DEAD;
-						break;
 					case '#':
 						memcpy( srec->tuid, buf + tn + 2, TUIDL );
 						debug( "TUID now %." stringify(TUIDL) "s\n", srec->tuid );