This simplifies many aspects. However, it still needs much better
styling.

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
from a page within a deeper namespace, the first X namespaces will be
added as filter.
Possible use case could be with language namespaces to ensure that the
default search is initially within the current language.

`search_default_fragment_behaviour`:
Option to specify the default fragment search behavior

There are several use cases in which knowing the page where a search
request originated would be useful. This commit adds a `from` parameter
which provides that information.

This makes it easier to read, reason and extend.

To allow creating links with manipulated versions of the current search
query an unparser is necessary. However, the current output of ft_queryParser
makes some advanced features hard to detect. Therefore the new
ft_queryUnparser_simple cannot handle negated phrases and `OR` searches.

It should still cover 98% of search queries.

Plugins may want to offer more ways to filter the search results.

Add events around each search result, both for the pagename results
and the fullpage results.

The fullpage results are wrapped in a div for better separation and
styling.
( see https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dl )

These events are intended to provide plugin authors with the ability
to hydrate the search results with more information.

This add some search assistance to simple, single-word search queries
which may be restricted to a single namespace.

Further improvements:
* better styling
* trigger events for other plugins
* set namespaces directly from fulltext search results
* some more config options

Add the search form on the results page itself. This form will be used
to add more options to refine the search further.

This commit should be without functional changes.

Translation update (pl)

Add return flags to breadcrumbs and you are here to allow later processing

Local Drafts: show diff instead off full text

Changes cursor position to end of inserted image syntax, implements #2079 

Refactored section edit

Translation update (pt-br)

Remove createMock* polyfill for PHPUnit to let PHP 7.2 tests run

Translation update (ko)

try to display an error when installer is run without php

Translation update (uk)

The data for the section edit button is now passed as an assoziative array which is
encoded in the '#<!-- EDIT(.*) -->#' placeholder as an JSON array.

Translation update (sk)

When a server has no PHP support enabled, it will either prompt to
download a PHP file or may display it as HTML instead. When a user tries
to run install.php with a server that does the latter, they will see
some weird garbage with the browser trying to interpret raw PHP as HTML.
This pathc adds a warning at the top, telling the user what is going on.

Translation update (sl)

Translation update (sl)

move class DokuHTTPClient behind HTTPClient

2 different people reported errors that seems to be solved when following the "If a class extends another, then the parent class must be declared before the child class structure." of http://php.net/manual/en/language.oop5.inheritance.php
Couldn't exactly reproduce under which php/environment the problem occurs, but following the MUST of the PHP documentation seems not to be wrong..

https://github.com/Flyspray/flyspray/pull/647