Fixed tab filename display & rename title

Simplified background on .tab class, also set it to relative positioning
and removed text having a RTL direction and being right aligned. Then
set the .closeTab class to also be absolutely positioned and 7px from
the right edge. Now the text is left aligned and close tab link right
aligned!
Renaming open tabs also now updates title
Fixed 2 x titles to have slashes at start now we aren't using RTL
direction