try to display an error when installer is run without php

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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.

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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

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remove deprecated method call from html_login

feat: add optionally an SVG to html_btn

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To prevent abusing this functionality for inserting arbitrary html,
inlineSVG is now called inside the html_btn function.

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Updated README: Upped year to 2018

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Update all.css (Fixes #2169 table alignment RTL-support)

Fixes #2169 table alignment RTL-support