Plugins may want to add further fields to be present when saving drafts

These shouldn't be there anymore since the plugins have been deleted

authmysql and authpgsql were replaced by authpdo two releases ago.

fixes #2330

Punctuation is more natural, makes sense with CSS switched off
and makes screenreaders add a little pause.

This implements some of the changes discussed in #2314:

1. last mod and number of hits are on the same line and always shown
2. There is a class around the last mod string so it can be
hidden/replaced by an icon
3. All items in the resultBody returned by the event are wrapped in
`<dd>` tags to ensure validity. They get their array key as class
4. There is still a wrapper div around each result for styling purposes

Recent changes to the search results page added various divs
to the pre-existing description list, which is invalid.
This fixes that by a) removing a couple of unnecessary elements
and b) interpret the 'last modified' line as another 'dd'.

shorter names are more in line with what we already use, makes less
layout problems in the documentation and is easier to type when telling
people about it.

This should make their purpose more obvious.

This removes a lot of reudundant CSS classes in favor of cascading
selectors. Styling isn't done, yet this is just a first step.

Still to do:

* aria labels
* styling the toggle mechanism
* RTL styling
* making sure everything displays correct when no JS is available
* translations may be missing
* refactoring the rest of search.less to make use of LESS features

This functionality is inspired by what other large search engines are
doing.