add startup_gettext() calls to several endpoints for unregistered users so the output would be translated based on accept-language header

which cna have a value of tls, ssl or be empty.  This is used for secure SMTP servers.
Also added the ability to have multiple email addresses in the to field.  Addresses are
separated by semicolons (;)

better support for atom:link elements in rss feeds, support rel=standout (fuck you google and your nonstandard shit)

default.css to make custom themes easier

I assumed the format string was related to strftime except all of the
fields looked really weird.  After digging in the code, this string is
actually used with php's date().  Add a note for this so other people
can jump quickly to the relevant documentation (which is useful for
non-php peeps who have no idea what this is).

db-prefs: better error output for missing prefs, digest: hide DIGEST_ENABLE pref missing for unitialized users

If the feed cannot be parsed there is not particular error but always "Unknown/unsupported feed type". The patch uses the error from the XML parser which gives more detailed error reporting.