+ * po: Check that translated underlay directories exist before using them
+ for master language.
+ * po: Configuring the same language as master and slave confuses processing;
+ so filter out such a misconfiguration.
+ * calendar: Add archive_pagespec, which is used by ikiwiki-calendar to
+ specify which pages to include on the calendar archive pages.
+ (The pagespec can still also be specified on the ikiwiki-calendar command
+ line.)