If there's no next_cron date, use the oldest date we can find.
Fix for comparing theme class file possibilities on Windows.
revise FlickrSilo to permit instantiation of Flickr class with specific user ID. Add post_content_out() filter that replaces tokens of the form [flickr:1234] with the proper embedded media from Flickr
revise FlickrSilo to use Habari shortcode format
return the shortcode if unable to process fully
Do not filter fields on a post during insert.
add logging to failed remote requests for crons
Use async crons, unless the config says otherwise.
SQLite blocks async cron requests, so don't do that.
Merge branch '0.9.1'

Conflicts:
	classes/crontab.php
	index.php