Standardized node.textContent is available since IE9

This makes sure the provided callback is using alphanumerics only. I'm
not sure this is needed, but better safe than sorry.

because we actually want it in this branch ;-)

This reverts commit 38a2174b.

this was an accidental commit to master

This reverts commit f7f7fb6c.

This introduces a mechanism to override what happens when a media item
is selected in the media manager popup by providing a callback name in
the URL. The default implementation just does what
dw_mediamanager.insert did before and calls insertTags()

This change adds a new class to the quicksearch's <form>
element while the quicksearch is running. This is to
make it easier to style the form, e.g. with a throbber gif
in the search box, to indicate that something is happening.
For slow connections, it is sometimes not apparent that
waiting for a few seconds will present the user with a list
of matching pagenames.

The new 'searching' class is added just before the POST
request is sent, and cleared both on successful completion
and when the search box is cleared.

adds aria handling to makeToggle and allows to supress it in dw_toggle

It is helpful if the pipe is still inserted by the linkwizard when there
is no title. This increases usability for beginners.

When the picker button is near the border of the screen, then an opening panel of picker buttons can go over the screen edge. That's not convenient. So we should add a check in a `function pickerToggle()` and shift picker buttons position if needed.

Add the class .bounce to any element to let it bounce slightly for 2
seconds. This is useful to make the user aware of some element. Can be
combined with #scroll__here when a long list auto scrolls to a certain
item.

This adds a subtle animation effect when scrolling to the #scroll__here
behaviour ID. It also adds a 100px offset to make the object not stick
to the browser border.

This now pulls all data from official jQuery sources. Either their CDN
or their github account. Google tends to serve outdated or even broken
files :-(

Unfortunately there's no simple way to get the latest stable jQuery-UI
so for now the version has to be adjusted manually in the script.

The edittable plugin broke uploading in IE8 (and maybe others) because
the Handsontable script adds a function to the Array prototype and the
uploading script did not properly check that.

we now pull jQuery directly from jquery's CDN instead of google because
google serves slightly outdated versions under the /1/ branch

The updated smoothness theme currently breaks compression. Haven't
figured out why, yet.

MSIE 11 tries hard to break any previous working browser detection
even through feature checks. This resolves to browser sniffing (MSIE for
old IE, Trident for IE11+)

See https://forum.dokuwiki.org/thread/10824

Minified jQuery contains a source mapping hint that will result in a 404
in Chrome. I removed the hint for now. A better solution (eg. fixing the
mapping URL) should be found.