Fixed Class-References in session.php

session.php:
-Fix Classname-References (REmoteSessionHandler)

install.lng.php:
-Added missing Translation (sysvsem, session)
Always "never-end"-sessions

login.php:
- Always be able to set a session as "never-ends"
  --> not only when cookies are activated
Changed folder-selection in add.php

add.php:
-changed the way you select the folder to download
Menu (Header) now fixed on top while scrolling

styles/onelineblue/style.css:
- change header to be fixed at top while scrolling down
Some css-styling for the menu

styles/onelineblue/style.css:
-change header-width to 97.7 to fit layout
-width of div for foldericons set to 49px
Added Traffic Info-Box

inc/boxarea.php
 --> Added new Info-Box: Traffic
 --> shows overall rtorrent-Traffic for one session (if you restart rtorrent, counter would be reset)
 --> Same behaviour as other InfoBoxes
formatting
Improve Traffic-Box

boxarea.php:
-used the given method "format_bytes" to format Traffic-Stats properly
-added Total-Value (Up + Down) [Some day, maybe there is a nice icon]
tabs deleted
Refresh Traffic-Box infos with ajax

ajax/index.ajx.php:
 -Added Traffic-Infos to the Ajax-Uotput (from $global)
inc/boxarea.php:
 -no longer a rpc-request in the renderBoxTrafficStats-function
 -get values from the $global-Array
 -do some html-rewriting to make the traffic-box nicer
inc/global.php:
 -extend the rpc-multicall to get traffic-infos (get_down_total, get_up_total)
 -fill traffic-infos to the $global-Array (downtraffic, uptraffic)
js/refresh.js:
 -get the new added data from ajax-request and put them into the right boxes
 -changed the inital value (y) from the for-loop to 9 (6 existed + 3 new added data/infos)
styles/onelineblue/style.css:
 -added two new rule to display traffic-infos proper (#boxtraffic div.label, div.traffic)
images/onelineblue/equal.png:
 -icon for total traffic
images/newbluw/equal.png:
 -icon for total traffic
Collapsable torrent-groups

index.php:
 -changed (table)output to fit torrents in scetions --> added tbodys around the grouped torrents
js/index.js
 -new way to find the right place for detail-inline-input
style.php (newblue, oneline)
 -close the tbody-tag for every section
js/collapse.js:
 -new js function to open and close the grouped torrents
Added new column to torrenttable (time torrent was added)

inc/defines/torrent.php:
 -define "ADDED" value --> must be 18 to match the order of rpc-request (list.fun.php)
inc/functions/list.fun.php:
 -add "d.timestamp.started"-Request to the multicall where torrent-infos are collected
index.php:
 -added table-header
 -added sortkey "added" and save in Session
 -save/get the timestamp
 -format added date (d.m.Y H:i)
ajax/index.ajx.php:
 -format added date (d.m.Y H:i)
 -clear $l['added'] in group-totals
inc/cp/mycp/account.php:
 -added value "ADDED" to the sortkey-array
inc/functions/details.fun.php:
 -display the new info also in the torrent-detail-view

languages/Deutsch/base.lng.php / languages/English/base.lng.php:
 -added title

styles/newblue/style.php / styles/onelineblue/style.php:
 -restructure the table that the new column will be displayed
 -set the number of columns to 13 (+1)