Add optional prefix to feed titles and correct minor issues

1) Add optional feed title prefix.

In  feed folder there can be unlimited number of rss feeds, and folder listing will show all feed results, sorted by date. If the are many feed sources on a listing, a user may want to know which feed title corresponds to which feed source, before selecting one.
I propose that an optional prefix can be added to the feed source.

For example, if feed sources in folder feed field are:
http://myplace/feed
http://another/feed

You can prefix them using | separator:
My place: |http://myplace/feed
(More feeds) |http://another/feed

then feed titles would be prefixed accordingly:
My place: Title of the feed in myplace
(More feeds) Title of the feed in another

2) Correct exception condition that gives a syntax error (DateTime.SyntaxError)

3) catch occasional KeyError in linkDict 
I have found that some responses contain a 'href' key.