Show comments URL for Atom feeds as per RFC 4685.
See https://tools.ietf.org/html/rfc4685#section-4
Note that only the first link with type "text/html" is taken into consideration.
Every once in a while, one of my feeds would throw an XML parse error
because it used ` ` or some other HTML entity. I feel Miniflux
should be lenient here, and Go already has a handy hook to make this
work.
Miniflux couldn't deal with XHTML Summary elements.
- Make Summary an 'atomContent' field
- Define an atomContentToString function rather than inling it three times
- Also properly escape special characters in plain text fields.
- Feeds with charset specified only in Content-Type header and not in XML document
- Feeds with charset specified in both places
- Feeds with charset specified only in XML document and not in HTTP header
