Safari 9 in iOS does not support the use of `const` in strict mode. Unfortunately, some of us are stuck with Safari 9 due to not being able to upgrade.

I am a big fan of progressive enhancement, but because all javascript code is packed together and sent off to the client, this small incompatibility breaks all javascript for safari 9 browsers. Switching these two keywords makes everything work again.

There are no other uses of `const` in the codebase as far as I can find. This change has little to no impact on anything else, but slighlty extends the range of supported browsers.

Plugins may want to add further fields to be present when saving drafts.
Plugins may want to execute some js functionality that should be timed to
the saved draft/refreshed lock.

If a plugin does another init() to attach the dw_locktimer to its own editor,
then the default callback would be added a second time, causing unexpected
and undesired behavior.

This includes the changes from the following commits:
6ef45cc1
6ca947f3
0fff419c
87bed8b6

This change is useful for plugins that may want to implement their own toolbar (and thus hide the
default toolbar), but still would like to let the locktimer set the draft status.

Safemode has been removed in PHP 5.4.0. We finally no longer need to
deal with this insanity.

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'.