Sanitize Feed code/Make feeds page more usable

Work-In-Progress v1

WIP v1 addresses the following:

• Will show the last few items for each feed
• Will allow the user to specify a user-defined title for each feed.
• Codebase was sanitized

WIP v1 has some remaining issues to be evaluated/resolved:

• max items to show currently is hard coded to 14 days / 30 items. This is enough for e.g. TV show RSS feeds. However one might consider to make this a config setting
• edit is still not implemented (wasn't before) but throws an exception now
• The template changes (especially those concerning highlighting new items within 2 last 2 days) don't seem clean to me. Not experienced with smarty.
• The feeds schema changed. install.php was updated accordingly. However it there is no migration strategy for old existing DBs.

Hey,

I got SSL feeds working, dont know if you want to add to your diff script. Line Numbers and code:

7621 + curl_setopt($fp, CURLOPT_SSL_VERIFYHOST, FALSE); 7622 + curl_setopt($fp, CURLOPT_SSL_VERIFYPEER, FALSE);