Revert "Ui/Sparklines: Remove img src before putting it into DOM"

This reverts commit a75796c64d397d37f1d41ae3d7e6bdf119b340d9.
UI/Sparklines: Change sparkline code to serverside only

fixes #6124
Add host discovery to authentication page

Find all domains for a given hostname.

refs #6093

Conflicts:

	application/forms/Install/AuthenticationPage.php
Move dns discovery functions into separate class

Add functions to lookup and reverse-lookup domain names and move the ldap
discovery function into a separate class

refs #6093
Merge branch 'feature/ldap-discover-by-dns-6093'
Detect ldap default naming context

Read the entries in the RootDTS of the given ldap server, to discover
its default naming context and capabilities

refs #6097
refs #6096
Merge branch 'feature/ldap-get-naming-contexts-6097'
Fix invalid default logging configuration
Fix that calling ActionController::translate() throws an exception

Translating strings must not throw an exception
even if the given domain is not valid.

fixes #6432
Do not throw an exception when the username does not exist

refs #6457
Check ldap backend health during Authentication

Check if authentication is possible during authentication, to generate more
useful error and log messages, in case the backend configuration is wrong

ref #6457
Call extended backend health checks when creating ldap authentication backends

fixes #6457
Autologin: Do NOT sanitize username

I don't know the reason why this was done initially but a username must not be changed.
Autologin: Use REMOTE_USER for authentication

It's not safe to rely on PHP_AUTH_USER and PHP_AUTH_TYPE because
PHP cgi handlers (fgcid for example) only set the REMOTE_USER environment variable
and the authentication type for negogiation methods (Kerberos for example) is neither
Basic nor Digest.
We may have to add REDIRECT_REMOTE_USER for authentication for proxy setups.
Autologin: Do not require a bogus password in the source code
Autologin: Do not use absolute `use'
Autologin: Actually set the username upon authentication

Before, when using autologin the username of the authenticated user always was the empty string.
Autologin: Fix PHPDoc
CSS/pagination: avoid text-selection

Clicking fast through pagination resulted in irritating text
selections and therefore uncomfortable behaviour. Should be
fixed now.
CSS/tables: improve row hover styles

Added a default hover color, fix inheritage and missing states.