notmuch restore: Fix to remove all tags before adding tags.

This means that the restore operation will now properly pick up the
removal of tags indicated by the tag just not being present in the
dump file.

We added a few new public functions in order to support this:

	notmuch_message_freeze
	notmuch_message_remove_all_tags
	notmuch_message_thaw

1 files changed, 2 insertions, 0 deletions

diff --git a/database.cc b/database.cc
index ad91a7d..9831d79 100644
--- a/database.cc
+++ b/database.cc
@@ -166,6 +166,8 @@ notmuch_status_to_string (notmuch_status_t status)
 	return "Erroneous NULL pointer";
     case NOTMUCH_STATUS_TAG_TOO_LONG:
 	return "Tag value is too long (exceeds NOTMUCH_TAG_MAX)";
+    case NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW:
+	return "Unblanced number of calls to notmuch_message_freeze/thaw";
     default:
     case NOTMUCH_STATUS_LAST_STATUS:
 	return "Unknown error status value";