FavIcon now quietly handles empty icon URLs, and is more graceful when lacking fileinfo extension.

Also, install.php will now warn if PHP is missing the fileinfo extension.  If it is not available, FavIcon will now allow some well-known extensions through blindly, even if they are served with incorrect content-types, rather than rejecting them.
Fixed an issue when rendering errors in fof_update_feed().

Was checking isset() instead of for false.  False variables are still set, it turns out.
Send notices from FavIcon to fof_log.

Any informational notices from processing favicons will be rerouted to the log with a label of 'favicon'.  Warnings and errors will still be reported through the default mechanism.
Fewer warnings from FavIcon.

Quieted warnings from fetching resources.  (Still generates rewritten notices.)
Allow processing of items lacking required fields.

Empty item titles were going unchecked and causing constraint violations.  Added check for title and content, and moved the per-field checks closer to where each field is set.
Also fixed a logging issue during item updates, to consistently note the feed_id being updated, rather than the previous item's id.
Remove spurious popup text on site icons