Renamed from camel_mbox_summary_expunge. Takes a gboolean saying whether

Renamed from camel_mbox_summary_expunge. Takes a gboolean saying whether

	* providers/mbox/camel-mbox-summary.c (camel_mbox_summary_sync):
	Renamed from camel_mbox_summary_expunge. Takes a gboolean saying
	whether to expunge or just sync the mbox file. Change some
	g_errors to g_warning so we don't abort. Make the quick
	X-Evolution updating code lseek around correctly. Update the
	mbox mtime in the summary file even in the quick case.

	* providers/mbox/camel-mbox-summary.h: make
	CAMEL_MESSAGE_FOLDER_NOXEV not conflict with
	CAMEL_MESSAGE_FOLDER_FLAGGED defined in camel-mime-message.h

	* providers/mbox/camel-mbox-folder.c (mbox_close): call
	camel_mbox_summary_sync to save flag state if not expunging.
	(mbox_expunge): Update for camel_mbox_summary_expunge rename.