WebIf: Added classes into css.css, which are used in html code.

Remove

- html body form table.stats{margin-top:20px} - unnecessary
- emm.html, emm_running.html - for margin-top from main menu is used blank DIV for subnav
- in readers_lblweightu.html <H3> - unnecessary

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9524 4b0bc96b-bc66-0410-9d44-ebda105a78c1