SUI to index and notLoggedIn

The page that a logged in user sees at index.php will likely be the top
bar at every page.
Added a ribbon linked to GitHub on notLoggedIn
SUI to profile and viewq.php

This version does not regard the users' color and font preferences when
viewing profiles.

There is work to do at profile and search
SUI to registration page

Also removed the old 'capthca', may use a more secure later on.
SUI to search - sidebar

Tabs at sidebar - support for users without JS
Added jQuery address, needed for tabs semantic module
Name attribute for inputs is inserted by get()

To do: update printQ() ,
validate with JS that at least one field is filled in,
maybe do something more beautiful with the user list
SUI to search results

Users are printed as a Semantic table
Updated printQ
Nice messages inform you about how many results are shown.
Sidebar becomes smaller on small screens
Updated Semantic to 0.19.3
Improved styling at profile

Old div.warn are .ui.warning.message
Instead of changing the buttons' html, toggle class 'loading'
Properly added opengraph:url tag at profile
Moved css files to /css/

Semantic UI resources (fonts and images) had to be moved one level up,
but they are not and will not be included.
SUI to deleteacc and pending.php
SUI to friends and answer.php

At friends.php the value of the text input is also added to the friend
list, support for users without JS (kind of)
At pending.php removed link to the question, which would say that the
question has not been answered
SUI to deleteq.php, added button class .centered

The question (and answer if one exists) are now shown at deleteq.php
.centered works with buttons and uses absolute positioning
.ui.segments and .messages have text-align: justify
Added SUI success message at register.php
SUI to login, added class orangeBg, center940/480

Changed #qContainer and .question max-width
Added classes center940 and center480 to help with max-width
Added class orangeBg for an orange gradient background
Fixed small bug at profile.js, result of transition to semantic
Tabindex at login and notLoggedIn

Added tabindex
Added link to register at login
Option to stay logged in at notLoggedIn
Fixed intendation at notLoggedIn
SUI to changepass, improved register

At register added main.center940, edited .success.message
Use register.css to help styling at changepass.php
Merge 'semantic' part 1

For pull request #26